To identify the highest law officer in India:
1. The Attorney General of India, appointed under Article 76 of the Constitution, is the highest law officer and chief legal advisor to the Government of India.
2. The Advocate General serves at the state level, the Solicitor General is the second-highest law officer, and the Chief Justice of India is the head of the judiciary, not a law officer.
3. Thus, the Attorney General holds the top position among law officers.
Therefore, the correct answer is (3) Attorney General.