Simplify the Rational Expression $$\frac { x ^ { 2 } - 16 } { x ^ { 2 } + 8 x + 16 }$$

Multiple Choice

Simplify the rational expression. If the rational expression cannot be simplified, so state.
- $$\frac { x ^ { 2 } - 16 } { x ^ { 2 } + 8 x + 16 }$$

A) $\frac { 4 } { 8 x + 4 }$
B) $\frac { x + 4 } { x + 4 }$
C) $- 1$
D) $\frac { x - 4 } { x + 4 }$