Which one of the following statements about the Union Executive in India is correct?

• A. According to the Constitution of India, the total number of members of the Council of Ministers cannot exceed 20% of the total number of Members of the House of the people
• B. The rank of the different Ministers is determined by the President
• C. The Ministers are appointed by the President on the advice of the Prime Minister.
• D. Only a member of either House of Parliament can be appointed as a Minister