qualified optional survivor annuity
(1) In general For purposes of this section, the term “qualified optional survivor annuity” means an annuity— (A) for the life of the participant with a survivor annuity for the life of the spouse which is equal to the applicable percentage of the amount of the annuity which is payable during the joint lives of the participant and the spouse, and (B) which is the actuarial equivalent of a single annuity for the life of the participant. Such term also includes any annuity in a form having the effect of an annuity described in the preceding sentence.