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.
- $$f ( x ) = \frac { 4 x ^ { 2 } + 8 } { 4 x ^ { 2 } - 8 }$$

A) $y = 1$
B) $y = 4$
C) $\mathrm { y } = 8$
D) none