Ariz. Rev. Stat. § 15-1628
B. Elections to participate in the optional retirement programs shall be made as follows:
G. The Arizona board of regents may provide for the administration of such optional retirement programs and perform or authorize the performance of such functions as may be necessary for such purposes. The Arizona board of regents shall approve the company or companies from which benefits may be purchased under the optional retirement programs. Such optional retirement programs shall not permit loans. In giving its approval, the board shall consider: