The correct answer is option 4, The Attorney General of India. The Attorney General is the chief law officer of the Government of India and acts as a legal advisor to the government. This position is appointed by the President of India and is the highest law officer in the country. Option 1, the Chief Justice of India, is the highest-ranking judicial officer in the country and leads the Supreme Court, but is not the chief law officer of the government. Option 2, the Registrar of the Supreme Court, is a administrative officer who handles the administrative and procedural functions of the Supreme Court. Option 3, the Law Minister of India, is a political appointee who serves as the Minister of Law and Justice, responsible for legal affairs and legislation, but is not the chief law officer.