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Which set of ordered pairs represents a function?

A) {(0, 1), (1, 3), (1, 5), (2, 8)}

B) {(0, 0), (1, 2), (2, 6), (2, 8)}

C) {(0, 0), (0, 2), (2, 0), (2, 4)}

D) {(0, 2), (1, 4), (2, 6), (3, 6)}