Sec. 4. (a) The resolution may pledge and assign for the security of the revenue bonds all or part of the revenues or net revenues of the facilities.
(b) To adequately secure the payment of the revenue bonds and the interest on the bonds, the district and the district's officers, agents, and employees shall provide for the covenants and do other acts and things that:
(1) are necessary, convenient, or desirable to secure the revenue bonds; or
(2) may tend to make the revenue bonds more marketable.