Colo. Rev. Stat. § 24-51-1716
Any contributing member or affiliate member whose effective date of retirement is on or after December 31, 2004, may elect to receive a superannuation retirement allowance in accordance with any of the options hereinafter stated. Option A shall be deemed a basic option, and the amount of the annual retirement allowance payable under such option as determined under the provisions of section 24-51-1715 shall be the amount that shall be duly adjusted in computing payments to be made under options other than option A. Prior to application for retirement, any such election may be changed or revoked, but when a member files application for retirement and elects an option, such option may not thereafter be changed or revoked, except where the designated co-annuitant under option P2 or option P3 predeceases the member prior to the effective date of retirement, pursuant to section 24-51-1723 or 24-51-1724, whichever is applicable. This shall not preclude the member's right to have the option elected become effective as of the date of retirement. In addition to the provisions of this section, in any dissolution of marriage action in any district court of the state of Colorado, the court shall have jurisdiction to order or allow an annuitant who is a petitioner or respondent in such action, and who selected an option P2 or P3 at the time of retirement designating the annuitant's spouse as the co-annuitant, to revoke the co-annuitant designation and for an option A benefit to become payable thereafter to the annuitant. The option A benefit shall be the original option A amount calculated as of the annuitant's effective date of retirement increased by any increases in the basic retirement allowance granted in accordance with the provisions of the DPS plan document and section 24-51-1732 subsequent to the annuitant's effective date of retirement. If no option is elected by a member at or prior to the time of application for retirement, such member shall be considered to have automatically elected to receive the applicable benefit under option A.
C.R.S. § 24-51-1716