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

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