Find the Domain $$f ( x ) = \frac { 20 + x } { x - 3 }$$

Multiple Choice

Find the domain. Write the answer in interval notation. $$f ( x ) = \frac { 20 + x } { x - 3 }$$

A) $( - 20,3 )$
B) $( - \infty , \infty )$
C) $( - \infty , - 20 ) \cup ( - 20 , \infty )$
D) $( - \infty , 3 ) \cup ( 3 , \infty )$