Consider the following statements:

1) If the election of a person as President is declared void by the Supreme Court, acts done by him before the date of such declaration of the Supreme Court are not invalidated and continue to remain in force.

2) Impeachment is a quasi-judicial procedure.

3) During impeachment, the President cannot defend himself by taking service of the Attorney General or the Solicitor General or the Additional Solicitors General of India.

Which of the statements given above is/are incorrect?