4. Which relation is a function?

A.

{ (8, - 1), (2, - 1), (3, 8), (2, 5}

B.

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

C.

{ (-3, 4), (-2, 5), (0, 9), (0, 12) }

D.

{ (7, 12), (1, - 5), (3, - 10), (2, - 5) }

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