Find All Numbers Not in the Domain of the Function $f(x)=\frac{x^{2}-16}{x^{2}+4 x-32}$

Multiple Choice

Find all numbers not in the domain of the function
- $f(x) =\frac{x^{2}-16}{x^{2}+4 x-32}$

A) $4,-4$
B) 0
C) $-4,8$
D) $4,-8$