Determine Whether the Given Function Is One-To-One $$f ( x ) = \frac { 5 } { x - 4 }$$

Multiple Choice

Determine whether the given function is one-to-one. If so, find a formula for the inverse.
- $$f ( x ) = \frac { 5 } { x - 4 }$$

A) Not a one-to-one function
B) $f ^ { - 1 } ( x ) = \frac { x } { - 4 + 5 x }$
C) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { 4 \mathrm { x } + 5 } { \mathrm { x } }$
D) $f ^ { - 1 } ( x ) = \frac { - 4 + 5 x } { x }$