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.
- $$f ( x ) = \frac { x } { x ^ { 2 } + 7 }$$

A) $x = - 7$
B) $x = - 7 , x = 7$
C) $x = 7$
D) no vertical asymptote