(a) The commission shall terminate any regulations establishing an over-order price or commission marketing order issued under this article whenever it finds that such order or price obstructs or does not tend to effectuate the declared policy of this compact.

(b) The commission shall terminate any regulations establishing an over-order price or a commission marketing order issued under this article whenever it finds that such termination is favored by a majority of the producers who, during a representative period determined by the commission, have been engaged in the production of milk, the price of which is regulated by such order; but such termination shall be effective only if announced on or before such date as may be specified in such marketing agreement or order.

(c) The termination or suspension of any order or provision thereof shall not be considered an order within the meaning of this article and shall require no hearing but shall comply with the requirements for informal rulemaking prescribed by Section four of the Federal Administrative Procedure Act, as amended (5 U.S.C. § 553).