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