(a) Except as provided by subsection (c), any contract entered into by the board of education of a school district or any of its officers or employees acting on behalf of the board shall contain the mandatory contract provisions prescribed by the department of administration in form DA-146a, as amended.

(b) Except as provided by subsection (c), any contract entered into after the effective date of this act shall be deemed to have incorporated the mandatory contract provisions prescribed by the department of administration in form DA-146a, as amended, even if such provisions are not specifically contained in such contract.

(c) The board of education of a school district may omit any of the mandatory contract provisions prescribed by the department of administration in form DA-146a, as amended, upon the affirmative recorded vote of a majority of the members of the board. The board shall not have the authority to waive or omit from the provisions of any contract the provisions of Kan. Stat. Ann. §§ 72-1146 or 72-1147, and amendments thereto.