Which set of ordered pairs is a function
(1, -1), (2,-2), (3, -3) (1, 1), (2, 2), (2, -2)
(1, 1), (2, 2), (3, 3)
(1, 1), (2, 1), (3, 1)
(0, 1), (0, 2), (0, 3)