(1) In addition to the authority granted the district under section 32-9-119 (1)(n), (1)(o), and (1)(p), the district may invest its moneys in any of the following:

(a) Obligations of the United States government or its agencies and instrumentalities;

(b) Certificates of deposit or other evidences of deposit or investment of a bank, a savings and loan association, or any other state or federally regulated financial institution, which is federally insured;

(c) Bankers' acceptances drawn on and accepted by commercial banks;

(d) Collateralized prime commercial paper;

(e) Repurchase agreements and reverse repurchase agreements the underlying collateral of which consists of the instruments set forth in paragraphs (a) to (d) of this subsection (1);

(f) Money market mutual funds the portfolios of which consist of the instruments set forth in paragraphs (a) to (d) of this subsection (1);

(g) Securities of the district.

(2) In addition to the investments authorized by subsection (1) of this section, the district, for purposes of hedging against interest rate risk only and not for speculation, may enter into contractual arrangements involving debt futures and options on debt futures only on obligations of the United States government.

(3) Investment decisions shall be made with the judgment and care, under circumstances then prevailing, which persons of prudence, discretion, and intelligence exercise in the management of their own affairs and shall not be made for speculation but shall be made for investment, considering the probable credit quality of their capital as well as the probable income to be derived.

(4) The district shall establish a written investment policy with respect to investing the moneys of the district. The investment policy shall address, but shall not be limited to, liquidity, diversification, credit quality of principal, yield, maturity, and quality and capability of investment management, with primary emphasis on credit quality and liquidity.