The Treasurer of the State of Oklahoma shall upon becoming custodian of the Teachers' Retirement Fund, give a bond in the sum of Fifty Thousand Dollars ($50,000.00); the Executive Director shall give bond in the sum of Twenty-five Thousand Dollars ($25,000.00); and the Board of Trustees shall require any other employees and members of the Board of Trustees to give bond in such amounts as the Board may deem necessary, conditioned that said bonded persons will faithfully execute the duties of the respective offices. All bonds shall be made with a good and solvent surety company, authorized to do business in the State of Oklahoma; said bonds shall be made payable to the Board of Trustees and shall be approved by it and the Attorney General of Oklahoma. All expense necessary and incident to the execution of such bonds, including premiums thereon, shall be paid by the Board of Trustees from the Expense Fund.