What Inputs Are Defined for the Expression $$\frac { 9 x } { x ^ { 2 } - 9 x + 18 }$$

Multiple Choice

What inputs are defined for the expression? $$\frac { 9 x } { x ^ { 2 } - 9 x + 18 }$$

A) $R , x \neq 3 , x \neq 5$
B) $R , x \neq 2 , x \neq 9$
C) $R , x \neq 5 , x \neq 7$
D) $R , x \neq - 2 , x \neq - 9$
E) $R , x \neq 3 , x \neq 6$