Which ordered pair could you remove from the relation {(–1, 0), (1, 3), (2, 2), (2, 3), (3, 1)} so that it becomes a function?

(1, 3) or (2, 3)

(1, 3) or (3, 1)

(2, 2) or (2, 3)

(2, 3) or (3, 1)