(a) The properties of the authority and the income therefrom and all lease agreements made by the authority and income therefrom shall be forever exempt from any and all taxation in the State of Alabama. The bonds of the authority and the income therefrom shall be forever exempt from any and all taxation in the State of Alabama.
(b) Any of the bonds may be used by the holder thereof as security for the deposit of any funds belonging to the state or to any instrumentality or agency of the state in any instance where security for such deposits may be required by law.
(c) Unless otherwise directed by the court having jurisdiction thereof or by the document that is the source of authority, a trustee, executor, administrator, guardian, or one acting in any other fiduciary capacity may, in addition to any other investment powers conferred by law and with the exercise of reasonable business prudence, invest trust funds in any of the bonds.