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Which of the following sets of ordered pairs represents a function?
A. {(4, 1), (-11, -1), (8, 2), (-1 -2), (9, 4), (-2,-10)}
B. {(-2, -1), (-2, 5), (7, 8), (-2, 5), (3,9), (-3, 1)}
C. {(8, 2), (6,-2), (7,4), (-11,-4), (8,3), (-9, 5)}
D.{(2, 4), (-1,-1), (7, 2), (-1, -2), (6, 3), (2, -9)}​