(a) Each trustee of the state board is entitled to one vote. Except as provided by Subsection (b), at any meeting of the state board, a vote by a majority of the trustees present is necessary for a decision by the trustees.
(b) The concurrence of a majority of the members of the state board is required for a vote regarding:
(1) eligibility for service retirement described by Section 864.001;
(2) the computation of a service retirement annuity described by Section 864.002;
(3) a cost-of-living increase described by Section 864.013; or
(4) a lump-sum payment adopted under Section 864.014.