Find All Numbers for Which the Rational Expression Is Not $\frac{x^{2}-81}{x^{2}+5 x-14}$

Multiple Choice

Find all numbers for which the rational expression is not defined.
- $\frac{x^{2}-81}{x^{2}+5 x-14}$

A) $x=7$ and $x=-2$
B) $x=0$
C) $x=9$ and $x=-9$
D) $x=-7$ and $x=2$