Which of the following represents a function? A. (5, 2), (6, 2), (-5, -2), (-6, -2)
B. (4, 1), (4, 2), (4, 3), (4, 4)
C. (6, 8), (-2, 4), (7, 7), (6, 5)
D. (-3, 4), (-3, 4), (-3, -4), (-3, -4)

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