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9. Which sets of ordered pairs is a function?
A .(0, 1), (0, 2), (0, 3), (0.4)
B. (1,2), (2, 3), (2,3), (3, 4) C.(1,2),(2,2),(3,3),(4,4). D.(1,-1),(1,-2),(2,1)(2,2)​