(a) The board of directors of each school district in this state shall adopt student attendance policies.
(b) Each school district, as a part of its six-year educational plan, shall develop strategies for promoting maximum student attendance, including, but not limited to, the use of alternative classrooms and in-school suspensions in lieu of suspension from school.
(c) A student attendance policy may include unexcused absences as a mandatory basis for denial of promotion or graduation.