Find the Vertical Asymptotes, If Any, of the Graph of the Rational

Multiple Choice

Find the vertical asymptotes, if any, of the graph of the rational function.
- $$f ( x ) = \frac { x - 4 } { x ^ { 2 } - 5 x + 6 }$$

A) $x = - 4$
B) $x = 2 , x = 3$
C) $x = - 2 , x = - 3$
D) $x = 2 , x = 3 , x = - 4$