Which one of the following is not explicitly stated in the Constitution of India but followed as a convention?

• A. The Finance Minister is to be a member of the lower House
• B. The Prime Minister has to resign if he loses majority in the lower house
• C. All the parts of India are to be represented in the Council of Ministers
• D. In the event of both the President and the Vice-President deemitting office simultaneously before the end of their tenure, the Speaker of the lower house of the Parliament will officiate as the President.