(a) Liquidity shall be assured through investments in marketable authorized investments with existing maturities of one (1) year or less, short-term repurchase agreements, a State authorized investment pool, or money market funds. At least twenty percent (20%) of the portfolio shall be held in such instruments.

(b) No more than thirty percent (30%) of the portfolio may be invested in securities with maturities of longer than two (2) years.