Find the Specified Domain and Express It in Interval Notation $f ( x ) = x ^ { 2 } - 9$

Multiple Choice

Find the specified domain and express it in interval notation.
-For $f ( x ) = x ^ { 2 } - 9$ and $g ( x ) = 2 x + 3$ , what is the domain of $\left( \frac { f } { g } \right) ( x )$ ?

A) $( - 3,3 )$
B) All real numbers
C) All real numbers except $- \frac { 3 } { 2 }$
D) $\left[ - \frac { 3 } { 2 } , \infty \right]$