Which set of ordered pairs represents a function? answer choices {(2, 1), (5, 3), (6, 4), (1, 4)} {(5, 12), (7, 34), (9, 3), (9, 41)} {(5, 6), (5, 23), (4, 71), (3, 41)} {(11, 62), (11, 24), (4, 75), (31, 21)}