a. Select the transitive closure of the relation {(a,b), (c,d), (d, e)}. {(a,b), (b, c), (c,d),(d, e), (e, a)} b{(a, a),(a, b), (6,b), (c, c), (c,d),(d, d), (d, e)} "{(a,b), (b, c), (c,d), (d, e)} d{(a,b), (b, a),(c,d),(d,c), (d, e), (e, d)} e {(a,b), (c,d), (d, e)} ${(a,b), (c,d), (c, e), (d, e)}