Question $1$

If your working directory is $\frac{}{a}\frac{?}{b},$ which command$($s$)$ makes your working directory

$\frac{}{b}\frac{?}{a}?($Assume that $\frac{}{b}\frac{?}{a}$ already exists. Select all correct commands.$)$

swap a b

$cd*\frac{.}{\frac{?}{?}}\frac{b}{a}$

$mv\frac{a}{b}\frac{b}{a}$

$cd\frac{}{b}\frac{?}{a}$