Which set of ordered pairs represents a function? {(0, 1), (1, 3), (1, 5), (2, 6)} {(0, 0), (1, 2), (2, 4), (3, 4)} {(0, 1), (1, 2), (2, 3), (2, 4)} {(0, 0), (0, 2), (2, 2), (2, 4)}