If the Following Defines a One-To-One Function, Find Its Inverse $f(x)=\frac{8}{x-9}$

Multiple Choice

If the following defines a one-to-one function, find its inverse. If not, write "Not one-to-one."
- $f(x) =\frac{8}{x-9}$

A) $f^{-1}(x) =\frac{-9+8 x}{x}$
B) Not one-to-one
C) $f^{-1}(x) =\frac{9 x+8}{x}$
D) $f^{-1}(x) =\frac{x}{-9+8 x}$