The Prime Minister of India, at the time of his/her appointment
(a) need not necessarily be a member of one of the Houses of the Parliament but must become a member of one of the Houses within six months
(b) need not necessarily be a member of one of the Houses of the Parliament but must become a member of the Lok Sabha within six months
(c) must be a member of one of the Houses of the Parliament
(d) must be a member of the Lok Sabha