The IUPAC name of the following compound is:

$\displaystyle 3$-Hydroxy-$\displaystyle 4$-methylpentanoic acid

$\displaystyle 4$-Methyl-$\displaystyle 3$-hydroxypentanoic acid

$\displaystyle 4,4$-Dimethyl-$\displaystyle 3$-hydroxybutanoic acid

$\displaystyle 2$-Methyl-$\displaystyle 3$-hydroxypentan-$\displaystyle 5$-oic acid