A tax-preferred retirement savings program established pursuant to Section 21670 may grant the maximum tax-preferred retirement savings opportunities available under current federal law, and may provide for employer as well as employee contributions. The program may include, but is not limited to, one or more of the following plans:
(a) A deferred compensation plan described under Section 457 of Title 26 of the United States Code.
(b) A program described under Section 403(b) of Title 26 of the United States Code. Section 770.3 of the Insurance Code shall not apply to the board for the purposes of contracting for those annuities.
(c) Any other form of a tax-preferred retirement savings arrangement authorized by the provisions of Title 26 of the United States Code and approved by the board.