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f-1(x)=(a^2-ax-4)/(a-x)

Which of the following is true?

The function is the opposite of its own inverse for any value of a.

The function is its own inverse for positive values of a only.

The function is the reciprocal of its own inverse for positive values of a only.

The function is its own inverse for negative values of a only.

The function is its own inverse for any value of a.