Section 9-3-420 - Option as to form of benefit; beneficiary designations(a) Subject to uniform rules and regulations the board prescribes, a member may instead of the service retirement benefits provided in this article, elect one (1) of the following forms of retirement benefits which shall be the actuarial equivalent of the benefit to which he would otherwise be entitled: (i) A one hundred percent (100%) joint and survivor benefit which provides reduced monthly service retirement benefit payments during the retired member's life and upon his death after retirement continues payments in the same reduced amount to a designated beneficiary during the life of the beneficiary; (ii) A fifty percent (50%) joint and survivor benefit which provides reduced monthly service retirement benefit payments during the retired member's life and upon his death after retirement continues payments, in the amount of fifty percent (50%) of the reduced amount, to the designated beneficiary during the life of the beneficiary; (iii) A benefit which provides reduced monthly service retirement payments with provision for the continuance of payments for ten (10) years certain and life thereafter. If the retired member dies within ten (10) years after retirement, the remaining guaranteed payments shall be made to his designated beneficiary. This beneficiary may be changed at any time by written notification to the board as provided in subsection (b) of this section; (iv) The largest possible benefit for life with no lump sum refund or benefit for anyone else upon the retired member's death; (v) Any other modified monthly service retirement benefit, including any other modified joint and survivor monthly service retirement benefit, actuarially determined, which the board approves. (b) An election of an optional benefit shall be in writing and filed with the system prior to the first benefit payment. The election is final and not subject to change unless a designated beneficiary dies prior to the first benefit payment, in which case the election is void, the member may designate a new beneficiary and may select a different option. (c) The retirement benefits payable under optional forms available under this section shall be the actuarial equivalent amount of the normal benefit form under W.S. 9-3-415 and, if applicable, 9-3-431 and 9-3-432.