1. The Prime Minister, at the time of the appointment:1. need not necessarily be a member of one of the Houses of Parliament but must become a member of one of the Houses within six months. 2. need not necessarily be a member of one of the. Houses of Parliament but must become a member of the Lok Sabha within six months. 3. must be either a nominated or elected member of one of the Houses of Parliament. 4. must be an elected member of only Lok Sabha.?