Find the Derivative of the Function $f ( x ) = \frac { 1 } { x + 13 }$

Multiple Choice

Find the derivative of the function. $f ( x ) = \frac { 1 } { x + 13 }$

A) $- \frac { 1 } { ( x + 13 ) ^ { 2 } }$
B) $- \frac { 1 } { 2 \sqrt { x + 13 } }$
C) $\frac { 39 } { x ^ { 4 } }$
D) $\frac { 1 } { ( x + 13 ) ^ { 2 } }$
E) $\frac { 1 } { 2 \sqrt { x - 13 } }$