(1) The board shall employ a single custodian for the assets held by the fund. The custodian shall be responsible for:
(a) Physical safekeeping of all securities;
(b) Collection of all income;
(c) Effecting all principal and income transactions;
(d) Maintenance of a complete set of accounting records, including reporting to the board and participants on the assets, earnings and activity of each pool of the fund on a monthly basis, and reporting individual assets, earnings and activity to each participant on a monthly basis;
(e) Making principal payments to participants no later than forty-five (45) days after receipt of a request; and (f) Making available earnings to participants on a monthly basis, or returning earnings to the fund for reinvestment as directed by the participant.
(2) The custodian may upon request of a participant perform optional services such as but not limited to the following:
(a) Make disbursements for the participant; and (b) Prepare reports to beneficiaries or units of government.