(a)any person of full age and capacity,-(i)who is a citizen of another country, but was a citizen of India at the time of, or at any time after the commencement of the Constitution; or(ii)who is a citizen of another country, but was eligible to become a citizen of India at the time of the commencement of the Constitution; or(iii)who is a citizen of another country, but belonged to a territory that became part of India after the 15th day of August,1947; or(iv)who is a child or a grandchild or a great grandchild of such a citizen; or