Consider the following statements about a Constitution Amendment Bill under Article 368:

1. It requires the prior recommendation of the President before it can be introduced in either House of Parliament.

2. Once passed by Parliament with the required majority, the President is bound to give assent to it.

3. It must be passed by a special majority in each House separately, with no provision for a joint sitting in case of disagreement between the Houses.

How many of the statements given above are correct?