(a) An obligation issued by a municipality under this chapter must be:
(1) signed by the mayor or the presiding officer of the municipality;
(2) countersigned by the municipality's secretary or clerk; and
(3) impressed with the seal of the municipality.
(b) An obligation authorized by the board under this chapter must be:
(1) signed by the presiding officer of the board;
(2) countersigned by the secretary or assistant secretary; and
(3) impressed with the seal of the board.