Which relation is a function?
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A. (1,0). (3.0), (1, 1), (3, 1) (1, 3)
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B. (1, 1), (2.2), (3, 3), (4, 4), (5,8)
C. (2, 7). (6.5), (4,4), (3, 3), (2.1)
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6
D. (9. -3). (9,3), (4, -2). (4, 2). (0,0)

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