All bonds issued by the authority shall be and are hereby declared to be legal and authorized investments for public funds of counties, cities, towns, school districts, banks, savings banks, trust companies, building and loan associations, savings and loan associations, insurance companies, and for funds of the Mississippi Public Employees' Retirement System. Such bonds shall be eligible to secure the deposit of any and all public funds of cities, towns, villages, counties, school districts, or other political corporations or subdivisions of the State of Mississippi; and such bonds shall be lawful and sufficient security for said deposits to the extent of their value, when accompanied by all unmatured coupons appurtenant thereto.