Simplify the Complex Fraction $$\frac { \frac { 12 } { x + h } - \frac { 12 } { x } } { h }$$

Multiple Choice

Simplify the complex fraction.
- $$\frac { \frac { 12 } { x + h } - \frac { 12 } { x } } { h }$$

A) $- \frac { 12 } { x ( x + h ) }$
B) $\frac { 12 } { x ( x + h ) }$
C) $\frac { 1 } { x + h }$
D) $- \frac { 1 } { x + h }$