Which of the following relations is a function? {(–7, 6), (6, –7), (–7, 9), (10, 3)} {(5, –4), (–4, 5), (–5, 4), (4, –5)} {(2, –3), (–3, 2), (2, 3), (–2, 3)} {(8, –5), (–5, 8), (–5, –8), (–8, 5)}

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