(a) Any municipality or any board, commission, or other authority established by ordinance of any municipality or the boards of trustees, respectively, of the firemen's relief and pension fund and the policemen's pension and relief fund of any municipality or the board of trustees of any retirement system created by the General Assembly may, in its discretion, invest any of its funds not immediately needed for its purposes in bonds issued under the provisions of this subchapter.
(b) Bonds issued under the provisions of this subchapter shall be eligible to secure the deposit of public funds.