The relation R defined on the set A = {1, 2, 3, 4, 5} by R =  {(a,b):|a^2-b^2∣ less than 16} is given by (a) {(1, 1), (2, 1), (3, 1), (4, 1), (2, 3)} (b) {(2, 2), (3, 2), (4, 2), (2, 4)} (c) {(3, 3), (4, 3), (5, 4), (3, 4)} (d) none of these