Consider the relation R = {(a, a),(c, a),(b, c),(d, b)}then which of the following set represents R2? a) {(a, a),(c, a),(b, a),(d, c)} b) {(a, a),(c, a),(b,c), (d, b)} c) {(a, a),(c, a),(cb), (b, d)} d) {(a, a),(ca), (b, a),(d, a)} If the function f: R\{1} R\{1} defined by f(x) = then the composite function x-1' fof (x) =.......... a) x b) d)