Find the Inverse of the Function $f ( x ) = \frac { x - 7 } { 4 }$

Multiple Choice

Find the inverse of the function. $f ( x ) = \frac { x - 7 } { 4 }$

A) $f ^ { - 1 } ( x ) = x + 7$
B) $f ^ { - 1 } ( x ) = \frac { 4 x } { 7 }$
C) $f ^ { - 1 } ( x ) = \frac { x + 7 } { 4 }$
D) $f ^ { - 1 } ( x ) = 4 x + 7$
E) none of these