With reference to the Lokpal, consider the following statements:

1. The Lokpal's jurisdiction extends to Indian public servants posted abroad.

2. The Chairperson of the Lokpal must have been a sitting Chief Justice of India.

3. There is no minimum age requirement to be appointed Chairperson of the Lokpal.

4. The Lokpal has jurisdiction to investigate corruption allegations against a sitting Prime Minister, subject to specified safeguards.

Which of the statements given above is/are correct?