Let f: ZxZ+Z such that f(m, n) = mn. Then f is A 1-1 and onto B onto but not 1-1 C 1-1 but not onto D neither 1-1 nor onto The relation R= {(1,1),(1,3), (2, 2), (3,1),(3,3), (3, 4), (4,3), (4,4), (5,5)}. is A B an equivalence relation not an equivalence relation (not reflexive) not an equivalence relation (not symmetric) not an equivalence relation (not transitive) D