The Function F Is One-To-One $f ^ { - 1 } ( x ) = - 4 x$

Multiple Choice

The function f is one-to-one. Find its inverse.
-f(x) = 4x

A) $f ^ { - 1 } ( x ) = - 4 x$
B) $f ^ { - 1 } ( x ) = \frac { 4 } { x }$
C) $f ^ { - 1 } ( x ) = 4 x$
D) $f ^ { - 1 } ( x ) = \frac { x } { 4 }$