Find the Domain of the Function $$f ( x ) = \frac { 1 } { x - 9 } + \frac { 4 } { x + 1 }$$

Multiple Choice

Find the domain of the function.
- $$f ( x ) = \frac { 1 } { x - 9 } + \frac { 4 } { x + 1 }$$

A) $( - \infty , - 1 ) \cup ( - 1,9 ) \cup ( 9 , \infty )$
B) $( - \infty , \infty )$
C) $( - \infty , - 1 ) \cup ( - 1 , \infty )$
D) $( - \infty , 9 ) \cup ( 9 , \infty )$