R is a relation from {11, 12, 13} to {8, 10, 12} defined by y = x – 3. Then, R^{-1} is (a) ((8, 11), (10, 13)} (b) {(11,8), (13, 10)} (c) {(10, 13), (8, 11), (8, 10)} (d) none of these