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.
- $$f ( x ) = \frac { x + 1 } { x ^ { 2 } - 1 }$$

A) $x = - 1$
B) $x = 1 , x = - 1$
C) no vertical asymptote
D) $x = 1$