Which set of ordered pairs represents a function?


Question 1 options:

{(1, 2), (1, 3), (1, 4), (1, 5)}


{(4, 1), (3, 2), (3, 3), (1, 4)}


{(1, 6), (2, 2), (4, 7), (3, 2)}


{(1, 6), (3, 2), (4, 7), (3, 4)}