The bonds are legal and authorized investments for:
(1) a bank;
(2) a trust company;
(3) a savings and loan association;
(4) an insurance company;
(5) a small business investment corporation;
(6) a fiduciary;
(7) a trustee;
(8) a guardian; or
(9) an interest or sinking fund or other public funds of the state or a municipality, county, school district, or other political subdivision of the state.