The Authority may enter into agreements with agents, banks, insurers, or others for the purpose of enhancing the marketability of, or as a security for, its bonds. Any financial institution, investment company, insurance company or association, any personal representative, guardian, trustee, or other fiduciary, and any other public officer or unit of the State or a subdivision of the State may legally invest any money belonging to them or within their control in any bonds issued by the Authority.