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12. Which set of ordered pairs below is a function?
I . { (3, 7) , (-1, 9) , (-5, 11)}
II . { (9, -5) , (4, -5) , (-1, 7)}
III . { (-2, 1) , (3, -4) , (-2, -6)}
A. I only
B. II only
C. III only
D. I and II

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