Which of the following statements regarding the attendance of retired judges at sittings of the Supreme Court of India is/are correct? 1. Article 128 permits the attendance of retired judges at the sittings of the Supreme Court. 2. The Chief Justice of India may at any time request anyone who has held office as a Judge of the Supreme Court or of a High Court to sit and act as a Judge of the Supreme Court. 3. The Chief Justice of India may at any time, with the previous consent of the President of India, request any person who has held the office of Chief Justice of a High Court to sit and act as a Judge of the Supreme Court. 4. The Chief Justice of India may at any time, with the previous consent of the President of India, request any person who has held the office of a Judge of the Supreme Court to sit and act as a Judge of the Supreme Court. Select the correct answer using the code given below: