(a) An institution shall disburse a stipend to a fellow no less frequently than once per academic term. If the fellowship is vacated or discontinued, the institution shall return any unexpended funds to the Secretary at such time and in such manner as the Secretary may require.

(b) If a fellow withdraws from an institution before completion of an academic term, the institution shall refund to the Secretary a prorated portion of the institutional payment that it received with respect to that fellow. The institution shall return those funds to the Secretary at such time and in such manner as the Secretary may require.

(c) A fellow who withdraws from an institution before completion of an academic term for which the fellow received a stipend installment shall return a prorated portion of the stipend installment to the institution at such time and in such manner as the Secretary may require.