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3. For each of these relations on the set (1, 2, 3, 4), decide whether it is reflexive, whether it is symmetric, whether it is antisymmetric, and whether it is transitive. a) {(2, 2), (2, 3), (2, 4), (3, 2), (3, 3), (3, 4)) b) {(1, 1), (1, 2), (2, 1), (2, 2), (3, 3), (4,4)} c) {(2,4), (4,2)) d) {(1, 2), (2, 3), (3, 4))