Consider the following statements about the collegium system:

1. The Supreme Court collegium is a five-member body, which is headed by the incumbent Chief Justice of India (CJI) and comprises four other seniormost Judges of the Court at that time.

2. The Parliament by law has evolved the collegium system.

3. The Judges of the Supreme Court and High Courts are appointed only through the collegium system.

4. The collegium system was introduced in the year 1993 by Justice P. N. Bhagwati in the landmark First Judges Case.

Which of the above statements is/are correct?