Give the Equations of Any Vertical Asymptotes for the Graphs $$f ( x ) = \frac { x - 7 } { x ^ { 2 } - 9 }$$

Multiple Choice

Give the equations of any vertical asymptotes for the graphs of the rational functions.
- $$f ( x ) = \frac { x - 7 } { x ^ { 2 } - 9 }$$

A) $x = 7$
B) $x = 3$
C) $x = - 3$
D) $x = 3 , x = - 3$