(a) A State plan for financial assistance programs under title I, IV-A, X, XIV, or XVI (AABD) of the Social Security Act must provide that methods of personnel administration will be established and maintained in public agencies administering or supervising the administration of the program in conformity with the Standards for a Merit System of Personnel Administration, 5 CFR part 900, subpart F, which incorporates the Intergovernmental Personnel Act Merit Principles (Pub. L. 91-648, section 2, 84 Stat. 1909), prescribed by the Office of Personnel Management pursuant to section 208 of the Intergovernmental Personnel Act of 1970 as amended.