(a) An obligation issued under this chapter by the authority may be made payable from and secured by a pledge of:
(1) all the revenue derived from the operations and devices of the authority's improvements and facilities, excluding any revenue derived from a tax or assessment;
(2) only the revenue derived from the operation of the authority's improvements and facilities acquired with the proceeds from the sale of the obligation; or
(3) a specific part of the revenue derived from the operation of the authority's improvements and facilities.
(b) The proceedings authorizing the issuance of the obligation must identify the method described by Subsection (a) that is to be used to pay and secure the obligation.