Whenever and/or as often as a person entitled to payments hereunder shall be under legal disability, or, in the sole judgment of the board, shall otherwise be unable to apply such payments to his best interests and advantage, the board in the exercise of its discretion may direct that all or any portion of the benefits of such members payable in any one or more of the following ways:
(a) Directly to such person;
(b) To his legal guardian or conservator;
(c) To his spouse, or to any person to be expended for his benefit.
The decision of the board shall, in each case, be final and binding on all persons including the affected member of the plan.
(Code 1958, § 21-60)