4. (28 points) Consider the following relations, determine whether the relation described is reflexive (R), symmetric (S), antisymmetric (AS), and transitive (T). Report the results in a table, for example, 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)} e) {(1,1),(2,2),(3,3),(4,4)} f) {(1,3),(1,4),(2,3),(2,4),(3,1),(3,4)}