Relation R in the set A of human beings in a town at a particular time given by
(a) R = {(x, y) : x and y work at the same place }
(b) R = {(x, y) : x and y live in the same locality}
(c) R = {(x, y) : x is exactly 7cm taller than y }
(d) R = {(x, y) : x is wife of y }
(e) R = {(x, y) : x is father of y }