Find the Derivative of the Following Function Using the Limiting $f ( x ) = \frac { 2 } { x + 7 }$

Multiple Choice

Find the derivative of the following function using the limiting process. $f ( x ) = \frac { 2 } { x + 7 }$

A) $f ^ { \prime } ( x ) = \frac { 2 } { ( x + 7 ) ^ { 2 } }$
B) $f ^ { \prime } ( x ) = - \frac { 2 } { ( x - 7 ) ^ { 2 } }$
C) $f ^ { \prime } ( x ) = - \frac { 2 } { ( x - 7 ) }$
D) $f ^ { \prime } ( x ) = - \frac { 2 } { ( x + 7 ) ^ { 2 } }$
E) none of the above