Explanation:

First option is incorrect. Attorney General of India must be a person who is qualified to be appointed as judge of Supreme Court in other words, he must have been a judge of some high court for five years or an advocate of some high court for ten years or an eminent jurist, in the opinion of the president. (Not retired or sitting judge of Supreme Court).
Second option is correct. The Attorney General (AG) is appointed by the president. He holds office during the pleasure of the president. This means that he may be removed by the president at any time. He may also quit his office by submitting his resignation to the president.
Third option is correct. He appears on behalf of the Government of India in all cases in the Supreme Court in which the Government of India is concerned.
Fourth option is correct. In the performance of his official duties, the Attorney General has the right of audience in all courts in the territory of India. Further, he has the right to speak and to take part in the proceedings of both the Houses of Parliament or their joint sitting and any committee of the Parliament of which he may be named a member, but without a right to vote.