After due consideration of the record, the Secretary shall render a decision. Such decision shall become a part of the record and shall include: (a) a statement of findings and conclusions, including the reasons or basis for such findings, upon all the material issues of fact, law, or discretion presented on the record, (b) a ruling upon each proposed finding and proposed conclusion not previously ruled upon in the record, (c) a ruling upon each exception filed by interested persons, and (d) either (1) denial of the proposal to issue an order, or (2) if the findings upon the record so warrant, an order, the provisions of which shall be set forth and such order shall be complete except for its effective date and any determinations to be made under §1200.16: Except that such order shall not be executed, issued, or made effective until and unless the Secretary determines that the requirements of §1200.16 have been met.