(a) a conservative principal protection fund;
(b) a growth fund;
(c) a secure return fund whose primary objective is the preservation of the safety of principal and the provision of a stable and low-risk rate of return; if the board elects to establish a secure return fund, the board may procure any insurance, annuity, or other product to insure the value of enrollees' accounts and guarantee a rate of return; the cost of such funding mechanism shall be paid out of the fund; under no circumstances shall the board, program, fund, the state, or any participating employer assume any liability for investment or actuarial risk; the board shall determine whether to establish or authorize such investment options based upon an analysis of their cost, risk profile, benefit level, feasibility, and ease of implementation;
(d) an annuity fund;
(e) a growth and income fund; or
(f) a life cycle fund with a target date based upon factors determined by the board.