Specify the Domain Of $( g \circ f ) ( x )$

Multiple Choice

Specify the domain of $( g \circ f ) ( x )$ for the pair of functions $f ( x ) = \frac { 3 } { 2 x } \text { and } g ( x ) = \frac { 1 } { x + 6 }$

A) $( - \infty , - 6 ) \cup ( - 6 , \infty )$
B) $( - \infty , 0 ) \cup ( 0 , \infty )$
C) $( - \infty , - 6 ) \cup ( 0 , \infty )$
D) $( - \infty , - 6 ) \cup ( - 6,0 ) \cup ( 0 , \infty )$