(a) The commission shall prescribe, amend, and interpret, subject to this article, such rules as may be necessary to insure the efficiency of the service and the selection and retention of employees upon a basis of merit and fitness. The rules shall not apply to bargaining unit members if the subject matter is within the scope of representation, as defined in Section 3543.2 of the Government Code, and is included in a negotiated agreement between the governing board and that unit. The rules shall be binding upon the governing board, but shall not restrict the authority of the governing board provided pursuant to other sections of this code.
(b) No rule or amendment which would affect classified employees who are represented by a certified or recognized exclusive bargaining representative shall be adopted by the commission until the exclusive bargaining representative and the public school employer of the classified employees who would be affected have been given reasonable notice of the proposal.