Find All Numbers That Are Not in the Domain of the Function

Multiple Choice

Find all numbers that are not in the domain of the function. Then give the domain using set notation.
- $f(x) =\frac{2 x+22}{x^{2}-1}$

A) $1 ;\{x \mid x \neq 1\}$

B) none; $(\infty, \infty)$

C) $-1,1 ;\{x \mid x \neq-1,1\}$

D) $-11,-1,1 ;\{x \mid x \neq-11,-1,1\}$