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which of the following sets of ordered pairs does NOT define a function? ​
A.{(3,2), (-3,6), (3,-2),(-3,-6)}
B.{(1,2), (2,6), (3,-2), (4,-6)}
C.{(2,2), (2,3), (2,4), (2,-9)}
D.{(4,4), (-3,4), (4,-4),(-3,-4)}