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 demitting office simultaneously before the end of their tenure the Speaker of the lower House of the Parliament will officiate as thePresident