Which of the following relations is a function?

A.

(6, 10), (-9, 2), (-1, 7), (-5, 10)

B.

(-1, 10), (-9, 2), (-1, 7), (-9, - 5)

C.

(10, 6), (2, - 9), (7, - 1), (10, - 5)

D.

(6, 10), (-9, 2), (-1, 7), (-1, - 5)

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