State which of the following sets of ordered pairs represent a function.Set A: (5, 2), (4, 3), (3, 4), (2, 5)Set B: (-1, -6), (0, 2), (1, 2), (3, 6)Set C: (2, 1), (4, 2), (2, 3), (8, 4)a.Set Cb.Set Bc.Set Ad.Set A and Set B