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

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