The correct answer is He/she should have been a High Court judge for at least 10 years. Explanation & Key Takeaways: Article 124(3) provides for the qualifications required for appointment as a Judge of the Supreme Court. The qualifications are:(a) The person should be acitizen of India; and (b) He/She should have been for at least five years a Judge of a High Court or of two or more such Courts in succession; or (c) He/She has been for at least ten years an advocate of a High Court or of two or more such courts in succession; or (d) He/She is, in the opinion of the President, a distinguished jurist. Important Notes: • Supreme Court of India came into existence on 26th January, 1950. • The original Constitution of 1950 envisaged a Supreme Court with a Chief Justice and 7 puisne Judges - leaving it to Parliament to increase this number.Parliament increased the number of Judges from 8 in 1950 to 11 in 1956, 14 in 1960, 18 in 1978 and 26 in 1986. As the number of the Judges has increased, they sit in smaller Benches of two and three - coming together in larger Benches of 5 and more only when required to do so or to settle a difference of opinion or controversy. • The Supreme Court of India comprises the Chief Justice and 33 other Judges appointed by the President of India. Supreme Court Judges retire upon attaining the age of 65 years. • The Constitution seeks to ensure the independence of Supreme Court Judges in various ways. A Judge of the Supreme Court cannot be removed from office except by an order of the President passed after an address in each House of Parliament supported by a majority of the total membership of that House and by a majority of not less than two-thirds of members present and voting, and presented to the President in the same Session for such removal on the ground of proved misbehaviour or incapacity. A person who has been a Judge of the Supreme Court is debarred from practising in any court of law or before any other authority in India. • The proceedings of the Supreme Court are conducted in English only. Supreme Court Rules, 1966 are framed under Article 145 of the Constitution to regulate the practice and procedure of the Supreme Court.