Which of the following statements is/ are correct regarding Constitutional Amendment Bill? Give correct answer:
1. Prior permission of President is required before introducing the Constitutional Amendment Bill in Parliament
2. Constitutional Amendment Bill can be introduced in either House of Parliament
3. President is bound to give his assent to the Bill if duly passed by both Houses of Parliament and ratified, if required, by the Legislatures of not less than one-half of the States
4. President may return the Bill to the Houses of reconsideration