Notwithstanding any restrictions on investments contained in any laws of this state, the state and all public officers, municipal corporations, political subdivisions, and public bodies, all banks, bankers, trust companies, savings banks and institutions, building and loan associations, savings and loan associations, investment companies, and other persons carrying on a banking business, all insurance companies, insurance associations and other persons carrying on an insurance business, and all executors, administrators, guardians, trustees and other fiduciaries may legally invest any sinking funds, moneys or other funds belonging to them or within their control in any bonds or other obligations issued by a housing authority pursuant to the Housing Authorities Law, compiled in title 13, chapter 20, and any amendments to that law, or issued pursuant to the Memphis Housing Authority Law, chapter 615 of the Private Acts of 1935, as amended by chapter 900 of the Private Acts of 1937, and any amendments to that law, or issued by any public housing authority or agency in the United States, when the bonds or other obligations are secured by a pledge of annual contributions to be paid by the United States government or any agency of the United States government. The bonds and other obligations shall be authorized security for all public deposits, it being the purpose of this section to authorize any persons, firms, corporations, associations, political subdivisions, bodies and officers, public or private, to use any funds owned or controlled by them, including, but not limited to, sinking, insurance, investment, retirement, compensation, pension and trust funds, and funds held on deposit, for the purchase of any such bonds or other obligations; provided, that nothing contained in this section shall be construed as relieving any person, firm or corporation from any duty of exercising reasonable care in selecting securities.