Evaluate the following limits \[\] $ \lim\limits_{ x \to 0} \large\frac{ \sin \: ax}{ \sin \: bx}, $$ a , b \neq 0$

Question

$\begin{array}{1 1}\large\frac{a}{b} \\ 0 \\ \large\frac{-a}{b} \\ \large\frac{b}{a}\end{array} $