Find the Derivative of the Function $f ( x ) = \frac { 4 } { x ^ { 3 } }$

Multiple Choice

Find the derivative of the function. $f ( x ) = \frac { 4 } { x ^ { 3 } }$

A) $- \frac { 12 } { x ^ { 2 } }$
B) $12 x ^ { 2 }$
C) 4
D) $- \frac { 12 } { x ^ { 4 } }$
E) $- 12 x ^ { 2 }$