QUESTION 1 Let A = {a,b,c,d) and B = (1,2,3,4) . The relations from A to B are given by R, = ((a,4).(b,4).(d, 1); R, = {(a,1). (b, 1).(c,3).(d,2); For each of the relation above, determine whether it defines a function from A to B. (2 marks)