Which of the following relations is NOT a function? A.
(-7, 4), (2, 3), (-3, 1), (7, 2)

B.
(-3, 4), (2, 2), (7, 1), (-7, 5)

C.
(2, 4), (-3, 2), (2, 1), (-7, 2)

D.
(7, 4), (-3, 2), (2, 1), (-7, 2)

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