The version control system has versions $1\mathrm{.}1,1\mathrm{.}2,2\mathrm{.}1,2\mathrm{.}2$ and

$1\mathrm{.}2\mathrm{.}1\mathrm{.}1.$ What is the correct way to delete version $1\mathrm{.}1?$

Delete version $1\mathrm{.}2\mathrm{.}1\mathrm{.}1,1\mathrm{.}2$ and $1\mathrm{.}1$

Delete versions in the order of $2\mathrm{.}2,2\mathrm{.}1,1\mathrm{.}2$ and $1\mathrm{.}1$

Delete $1\mathrm{.}1$

Delete versions in the order of $2\mathrm{.}2,2\mathrm{.}1,1\mathrm{.}2\mathrm{.}1\mathrm{.}1,1\mathrm{.}2$ and $1\mathrm{.}1$