Debentures issued under subpart D of this part shall be in such form and amounts; and shall be subject to such terms and conditions; and shall include such provisions for redemption, if any, as may be prescribed by the Secretary, with the approval of the Secretary of the Treasury; and may be in book entry or certificated registered form, or such other form as the Secretary by regulation may prescribe. [59 FR 49816, Sept. 30, 1994]