Consider the following statements about Constitution amendment bill.
1. The bill can be introduced by a minister and not by a private member.
2. The Bill does not require prior permission of the president.
3. In case of a disagreement between the two Houses of the Parliament,there is no provision for holding a joint sitting of the two Houses for the purpose of deliberation and passage of the bill.
4. The President can return the bill once, but if it is resent to the president's approval with or without modifications, the president has to sign the bill.
Which of the above statement is/are correct?