Which of the following sets of ordered pairs represents a function?
A. (2,3), (6,9), (10, 12), (2,-3)
B. (-9, 4), (-2, 10), (-2, 12), (0, 6)
c. (1,2), (4,9), (10,22), (15,7)
D. (0, 1), (0, 2), (0, 3), (0,4)

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