Find the Domain of the Rational Function $f ( x ) = \frac { - 7 } { 5 x + 4 }$

Multiple Choice

Find the domain of the rational function.
$f ( x ) = \frac { - 7 } { 5 x + 4 }$

A) $\{ x \mid x \text { is a real number and } x \neq 0 \}$
B) $\left\{ x \mid x \text { is a real number and } x \neq \frac { 4 } { 5 } \right\}$
C) $\left\{ x \mid x \text { is a real number and } x z - \frac { 4 } { 5 } \right\}$
D) $\{ x \mid x \text { is a real number and } x \neq 7 \}$