Subsequent to the approval by the Secretary of the annual budget of the Council or amendments thereto, a summary of such budget or amendments thereto, including a brief general description of the proposed research and nutrition education programs contemplated therein, shall be published in the Federal Register. All end product manufacturers not exempt hereunder shall have sixty days from the date of such publication within which to elect, under such conditions as the Secretary may prescribe, by so indicating to the Council in writing, by registered or certified mail, to reserve the right to seek refunds under subsection (b) of this section. Only those end product manufacturers who make such an election, under the described procedure, shall be eligible for refunds of assessments paid during the one-year period immediately following the expiration of such sixty-day period.