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1. Which of the following set of ordered pairs defines a function?
A. {0,-2), (1,1), (3, 7), (2,4)}
B. {(4,0), (4,1),(4,2)}
C. {(2, 2), (2,-2), (3, 3), (3, -3) (4,-4), (4,4)
D. {(0, 2), (0,4), (0, 6), (0, 8), (0, 10)​