3 Which of the following represents a function? A {(-2, 1), (-2, 0), (-2, 1), (-2, 2)} B {(-1,0), (0, 1), (1, 2), (2, 3)} C {(1, 3), (3, 1), (2, 3), (3, 2)} D {(5, 5), (5, 4), (5, 3), (5, 2)}​