7-3-221. Presiding officer of commission -- voting. The presiding officer of the commission:

(1) may vote as other members of the commission;

(2) is the executive, who may vote as the commissioners;

(3) is the executive, who shall decide all tie votes of the commission but may not have another vote (the presiding officer of the commission shall preside if the executive is absent); or

(4) is the executive but may not vote.