(b) i. Administrators, directors, supervisors, principals and all other members of the supervising staff, except associate, assistant and other superintendents appointed prior to July first, two thousand fifteen and authorized by section twenty-five hundred three of this article, shall be appointed by the board of education, upon the recommendation of the superintendent of schools for a probationary period of three years. The service of a person appointed to any of such positions may be discontinued at any time during the probationary period on the recommendation of the superintendent of schools, by a majority vote of the board of education. ii. Notwithstanding any other provision of law or regulation to the contrary, administrators, directors, supervisors, principals and all other members of the supervising staff, except associate, assistant and other superintendents, appointed on or after July first, two thousand fifteen and authorized by section twenty-five hundred three of this article, shall be appointed by the board of education, upon the recommendation of the superintendent of schools for a probationary period of four years; provided, however, that in the case of a principal, administrator, supervisor, or other member of the supervising staff who has been appointed on tenure pursuant to this chapter as an administrator within an authorized administrative tenure area in another school district within the state, the school district where currently employed, or a board of cooperative educational services, and who was not dismissed from such district or board as a result of charges brought pursuant to subdivision one of section three thousand twenty-a or section three thousand twenty-b of this chapter, the principal, administrator, supervisor or other member of the supervising staff shall be appointed for a probationary period of three years. The service of a person appointed to any of such positions may be discontinued at any time during the probationary period on the recommendation of the superintendent of schools, by a majority vote of the board of education. 2. a. At the expiration of the probationary term of any persons appointed for such term prior to July first, two thousand fifteen, or within six months prior thereto, the superintendent of schools shall make a written report to the board of education recommending for appointment on tenure those persons who have been found competent, efficient and satisfactory. By a majority vote the board of education may then appoint on tenure any or all of the persons recommended by the superintendent of schools. Such persons and all others employed in the teaching service of the schools of such school district who have served the full probationary period shall hold their respective positions during good behavior and efficient and competent service, and shall not be removable except for cause after a hearing as provided by section three thousand twenty-a or section three thousand twenty-b of this chapter. Failure to maintain certification as required by this chapter and the regulations of the commissioner shall constitute cause for removal. b. For persons appointed on or after July first, two thousand fifteen, at the expiration of the probationary term of any persons appointed for such term, or within six months prior thereto, the superintendent of schools shall make a written report to the board of education recommending for appointment on tenure those persons who have been found competent, efficient and satisfactory and in the case of a classroom teacher or building principal, who have received annual professional performance review ratings pursuant to section three thousand twelve-c or section three thousand twelve-d of this chapter, of either effective or highly effective in at least three of the four preceding years, exclusive of any breaks in service; provided that, in the case of a classroom teacher or building principal appointed during the two thousand seventeen--two thousand eighteen, two thousand eighteen--two thousand nineteen or two thousand nineteen--two thousand twenty school year, who have received composite annual professional performance review ratings pursuant to section three thousand twelve-c or section three thousand twelve-d of this chapter, of either effective or highly effective in at least one of the four preceding years, exclusive of any breaks in service, and did not receive an ineffective rating in the final year of his or her probationary period, or during the most recent school year where a rating was received, and would have been in the superintendent of schools' discretion qualified for appointment on tenure based upon performance, notwithstanding that his or her annual professional performance review had not been completed and he or she had not received an annual professional performance rating for the two thousand nineteen--two thousand twenty and two thousand twenty--two thousand twenty-one school years; provided that, in the case of a classroom teacher or building principal appointed during the two thousand twenty--two thousand twenty-one school year who have received composite annual professional performance review ratings pursuant to section three thousand twelve-c or section three thousand twelve-d of this chapter of either effective or highly effective in at least two of the four preceding years, exclusive of any breaks in service, and did not receive an ineffective rating in the final year of his or her probationary period, or during the most recent school year where a rating was received, and would have been in the superintendent of schools' discretion qualified for appointment on tenure based upon performance, notwithstanding that his or her annual professional performance review had not been completed and he or she had not received an annual professional performance rating for the two thousand twenty--two thousand twenty-one school year; provided further that, notwithstanding any other provision of this section to the contrary, when a teacher or principal receives an effective or highly effective rating in each year of his or her probationary service except he or she receives an ineffective rating in the final year of his or her probationary period, such teacher or principal shall not be eligible for tenure but the board of education in its discretion, may extend the teacher's probationary period for an additional year; provided, however, that if such teacher or principal successfully appealed such ineffective rating, such teacher or principal shall immediately be eligible for tenure if the rating resulting from the appeal established that such individual has been effective or highly effective in at least three of the preceding four years and was not ineffective in the final year. By a majority vote, the board of education may then appoint on tenure any or all of the persons recommended by the superintendent of schools. At the expiration of the probationary period, the classroom teacher or building principal shall remain in probationary status until the end of the school year in which such teacher or principal has received such ratings of effective or highly effective for at least three of the four preceding school years exclusive of any breaks in service and subject to the terms hereof, during which time a board of education shall consider whether to grant tenure for those classroom teachers or building principals who otherwise have been found competent, efficient and satisfactory. Provided, however, that the board of education may grant tenure contingent upon a classroom teacher's or building principal's receipt of a minimum rating in the final year of the probationary period, pursuant to the requirements of this section, and if such contingency is not met after all appeals have been exhausted, the grant of tenure shall be void and unenforceable and the teacher's or principal's probationary period may be extended in accordance with this subdivision. Such persons who have been recommended for tenure and all others employed in the teaching service of the schools of such school district who have served the full probationary period as extended pursuant to this subdivision shall hold their respective positions during good behavior and efficient and competent service, and shall not be removable except for cause after a hearing as provided by section three thousand twenty-a or section three thousand twenty-b of this chapter. Failure to maintain certification as required by this chapter and the regulations of the commissioner shall constitute cause for removal. 3. Associate superintendents and all other employees authorized by section twenty-five hundred three of this article, except as otherwise provided in subdivision one of this section, shall be appointed by the board of education, provided, however, that the board of education may enter into an employment contract with an associate, assistant, or other superintendent of schools for a period of from one to five years. 4. Clerks, draftsmen, inspectors, chemists, tabulating machine operators, secretaries, stenographers, copyists, statisticians, janitors, custodians, custodian-engineers, and all other administrative employees of a board of education, unless otherwise provided in this chapter, shall be appointed for a probationary period provided in the civil service law and regulations based thereon. The service of a person appointed to any of such positions may be discontinued by the board of education at any time during such probationary period. Such persons and all others employed in the administrative service of the board of education who have served the full probationary period shall hold their respective positions during good behavior and efficient and competent service, and shall not be removed except for cause after a hearing by the affirmative vote of a majority of the board. 5. No principal, supervisor, director, or teacher shall be appointed to the teaching force of such city school district who does not possess qualifications required under this chapter and under the regulations prescribed by the commissioner of education for the persons employed in such positions in the schools of the city school districts of the state, but a board of education may prescribe additional or higher qualifications for the persons employed in any of such positions. 6. Rules and regulations shall be adopted governing excusing of absences and for the granting of leaves of absence either with or without pay for all members of the teaching and supervising staff and other employees. 7. Notwithstanding any other provision of this section no period in any school year for which there is no required service and/or for which no compensation is provided shall in any event constitute a break or suspension of probationary period or continuity of tenure rights of any of the persons hereinabove described.