Question $2(1$ point$)$

Which function has a vertical asymptote at $x=3?$

a$)f(x)=\frac{x-3}{x-1}$

b$)f(x)=\frac{3x-5}{x-1}$

c$)f(x)=\frac{x3}{5x-1}$

d$)f(x)=\frac{x3}{x-3}$