N.C. Gen. Stat. § 135-61: Election of optional allowance.

Any member who retires under the provisions of this Article shall have the right to elect to have his allowance payable under any one of the optional forms provided for in G.S. 135-5(g), subject to the conditions therein contained, in lieu of the allowance that would otherwise be payable. (1973, c. 640, s. 1.)