Which function has an inverse that is also a function?
O
O
O
O
{(-1, -2), (0,4), (1, 3), (5, 14), (7,4)}
{(-1, 2), (0, 4), (1, 5), (5, 4), (7. 2)}
{(-1, 3), (0,4), (1, 14), (5, 6), (7, 2)}
{(-1, 4), (0, 4), (1, 2), (5,3), (7, 1);

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