The optional forms of retirement benefits are the following:
Social Security retirement age means, on any date, the age at which full Social Security benefits become payable as determined by the Social Security table in effect on that date.
The benefit payable under any optional form available under this section, other than the normal form, shall be the actuarial equivalent of the benefit otherwise payable to the participant under the normal form on the participant's retirement date. If the participant's retirement date is before the participant's normal retirement date, the benefit payable under any optional form other than a nondecreasing annuity payable for a period of not less than the life of the participant or an annuity decreasing during the life of the participant because of either the death of the survivor contingent participant but only if the reduction is not below fifty percent of the benefit payable before the death of the survivor contingent participant or the cessation or reduction of Social Security supplements or qualified disability payments as defined in 26 U.S.C. § 401(a)(11), may not be less than the actuarial equivalent of the benefit otherwise payable to the participant under the normal form on the participant's normal retirement date.
The election of an optional form is subject to the provisions of §§ 3-13C-13 and 3-13C-23.
Retirement benefits are nontransferable.
SDCL 3-13C-21