Find All Numbers for Which the Rational Expression Is Not $\frac { x ^ { 2 } - 25 } { x ^ { 2 } - 2 x - 35 }$

Multiple Choice

Find all numbers for which the rational expression is not defined.
- $\frac { x ^ { 2 } - 25 } { x ^ { 2 } - 2 x - 35 }$

A) $x = - 5$ and $x = 7$
B) $x = 5$ and $x = - 5$
C) $x = 5$ and $x = - 7$
D) $x = 0$