Find the Domain of the Rational Function $f ( x ) = \frac { x ^ { 2 } - 4 } { x ^ { 2 } + 15 x + 56 }$

Multiple Choice

Find the domain of the rational function.
$f ( x ) = \frac { x ^ { 2 } - 4 } { x ^ { 2 } + 15 x + 56 }$

A) $\{ x \mid x \text { is a real number and } x \neq 0 \}$
B) $\{ x \mid x \text { is a real number and } x \neq 8 , x \neq - 7 \}$
C) $\{ x \mid x \text { is a real number and } x \neq 2 , x \neq - 2 \}$
D) $\{ x \mid x \text { is a real number and } x z - 8 , x \neq - 7 \}$