Determine Whether the Given Function Is One-To-One $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = - 4 \mathrm { x }$

Multiple Choice

Determine whether the given function is one-to-one. If it is one-to-one, find its inverse function.
-f(x) = 4x

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