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Which of the following sets of ordered pairs CANNOT be considered as function?
A. (1,2), (-1,2), (5,3), (2,1)
B. (1,2), (-1,2), (5,2), (-5,5)
C. (4,10),(4,11), (2,11), (1,13)
D. (2,3), (4,3), (6,4), (8,5)​