Determine the values of n for which f (x) = x^2 has an inverse that is a function. Assume that n is a whole number.

I didnt see any answer options but on my test it said this:

Determine the values of n for which f (x) = x^n has an inverse that is a function.

a. n is even

b. n is odd

c. n < 0

d. n > 0

And if you have this answer option my answer would be B. N is odd