Find the Derivative of the Function $f ( x ) = \frac { 1 } { x ^ { 4 } }$

Multiple Choice

Find the derivative of the function. $f ( x ) = \frac { 1 } { x ^ { 4 } }$

A) $f ^ { \prime } ( x ) = - \frac { 3 } { x ^ { 5 } }$
B) $f ^ { \prime } ( x ) = - \frac { 4 } { x ^ { 3 } }$
C) $f ^ { \prime } ( x ) = - \frac { 4 } { x ^ { 5 } }$
D) $f ^ { \prime } ( x ) = - \frac { 5 } { x ^ { 5 } }$
E) none of the above