State which of the following ordered pairs is a function.


Set A: (-1, 0), (-2, 1), (4, 3), (3, 4)

Set B: (1, 4), (2, 3), (3, 2), (4, 1)

Set C: (2, 1), (3, 2), (2, 3), (1, 4)

a. Set A

b. Set B

c. Both Set A and Set B

d. Set C