In the Indian political system, the real executive power is vested in:

the Prime Minister and his Council of Ministers

The correct answer is Option 4 - the Prime Minister and his Council of Ministers

In the Indian political system, the real executive power is vested in the Prime Minister and his Council of Ministers.

Important Articles: COM, Prime Minister, and Attorney General

Article 74: Council of Ministers to aid and advise President
Article 75: Other Provisions as to Ministers (appointment of the Prime Minister)
Article 76: Attorney-General for India
Article 77: Conduct of business of the Government of India
Article 78: Duties of Prime Minister with respect to the furnishing of information to the President, etc.