Find All Vertical Asymptotes of the Function $y ( x ) = \frac { x - 5 } { x ^ { 2 } - 5 x + 4 }$

Multiple Choice

Find all vertical asymptotes of the function $y ( x ) = \frac { x - 5 } { x ^ { 2 } - 5 x + 4 }$

A) $x = 1 , x = 4$
B) $x = 1$
C) $x = 4$
D) $x = - 1 , x = 5$
E) $\text { no vertical asymptotes }$