Find the Domain of the Function $$f ( x ) = \frac { x ^ { 2 } } { x ^ { 2 } + 15 }$$

Multiple Choice

Find the domain of the function.
- $$f ( x ) = \frac { x ^ { 2 } } { x ^ { 2 } + 15 }$$

A) $( \infty , - 15 )$ or $( - 15 , \infty )$
B) $( - 15 , \infty )$
C) $( \infty , 0 )$ or $( 0 , \infty )$
D) $( \infty , \infty )$