Find the Domain of the Rational Function $$f ( x ) = \frac { x + 7 } { x ^ { 2 } - 1 }$$

Multiple Choice

Find the domain of the rational function.
- $$f ( x ) = \frac { x + 7 } { x ^ { 2 } - 1 }$$

A) $\{ x \mid x \neq - 1 , x \neq 1 , x \neq - 7 \}$
B) all real numbers
C) $\{ x \mid x \neq 0 , x \neq 1 \}$
D) $\{ x \mid x \neq - 1 , x \neq 1 \}$