Find All Numbers for Which the Rational Expression Is Not $$\frac { x ^ { 2 } - 16 } { x ^ { 2 } + 2 x - 24 }$$

Multiple Choice

Find all numbers for which the rational expression is not defined.
- $$\frac { x ^ { 2 } - 16 } { x ^ { 2 } + 2 x - 24 }$$

A) $x = - 4$ and $x = 6$
B) $x = 4$ and $x = - 4$
C) $x = 4$ and $x = - 6$
D) $x = 0$