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15. Which of the following sets of ordered pairs define a function?
A. {(3,2).(-3,5),(3,-2),(-3,-6)}
C. {(1,2),(2,6),(3,-2),(4,-6)}
B. {(2,2),(2,3),(2,4),(2,-9)}
D. {(4,4),(-3,4),(4,-4),(-3,-4)