Which relation is a function? A. {(–1, 2), (–4, 5), (1, 3), (0, –1)} B. {(–1, 2), (–1, 5), (1, 3), (–4, 5)} C. {(–1, 2), (1, 3), (1, 0), (–4, 5)} D. {(–1, 2), (1, 5), (1, 3), (–1, 3)}

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