Which of the following statements is/are not correct regarding President's Rule? 1. A proclamation of President's Rule may be revoked by the President at any time by a subsequent proclamation. 2. Such a proclamation requires parliamentary approval. 3. During President's Rule, the President can declare that the powers of the state legislature are to be exercised by the Parliament. 4. A law made by the Parliament or any specified authority continues to be operative even after the President's Rule.