Option 1.
The actuarial equivalent of the member's normal annuity in reduced monthly payments for life during retirement with the provision that upon the member's death, fifty percent of the reduced normal annuity shall be continued throughout the life of and paid to the member's spouse; or
Option 2.
Some other option approved by the board which shall be the actuarial equivalent of the annuity to which the member is entitled under this system.
§ 57.979, RSMo