Find the Domain of the Rational Function $$r ( x ) = \frac { x ^ { 2 } + x - 9 } { x ^ { 2 } - 13 x + 36 }$$

Multiple Choice

Find the domain of the rational function.
- $$r ( x ) = \frac { x ^ { 2 } + x - 9 } { x ^ { 2 } - 13 x + 36 }$$

A) All real numbers except $- 9$ and $- 4$ .
B) All real numbers except 9 and 4 .
C) All real numbers except $- 4$ and 9 .
D) All real numbers except $- 9$ and 4