Determine Whether the Given Function Is One-To-One $f ^ { - 1 } ( x ) = \frac { x + 4 } { 3 }$

Multiple Choice

Determine whether the given function is one-to-one. If it is one-to-one, find its inverse function.
-f(x) = 3x + 4

A) $f ^ { - 1 } ( x ) = \frac { x + 4 } { 3 }$
B) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { \mathrm { x } - 4 } { 3 }$
C) $f ^ { - 1 } ( x ) = - \frac { x + 3 } { 4 }$
D) not a one-to-one function