1. Which relation is a function?
A. ({-4, 3),(-2, 3),(-1, 2),(2, 5),(3, 2)}
B. {(-4, 1),(-2, 3),(-2, 1),(-1, 5),(3, 2)}
C. {(-4, 1),(-1, 2),(3, 5),(3, 2)}
D. {(-4, 1),(-2, 3),9-1, 1),(-1, 5),(3, 2)}

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