Find the Derivative of the Function $f ( x ) = \frac { 1 } { 14 x ^ { 3 } }$

Multiple Choice

Find the derivative of the function. $f ( x ) = \frac { 1 } { 14 x ^ { 3 } }$

A) $\frac { 1 } { 14 }$
B) $2 x + 14$
C) $2 x - 14$
D) $\frac { 42 } { x ^ { 4 } }$
E) $- \frac { 3 } { 14 x ^ { 4 } }$