Find the Derivative of the Function Using the Definition of Derivative

Multiple Choice

Find the derivative of the function using the definition of derivative.
- $$f ( x ) = \sqrt { x + 4 }$$

A) $f ^ { \prime } ( x ) = \frac { \sqrt { x + 4 } } { 2 }$
B) $f ^ { \prime } ( x ) = \frac { 1 } { 2 \sqrt { x + 4 } }$
C) $f ^ { \prime } ( x ) = - \frac { 1 } { 2 \sqrt { x + 4 } }$
D) $f ^ { \prime } ( x ) = \frac { \sqrt { x + 4 } } { x + 4 }$