For details, see the Extension Points - DiskRestriction chapter: https://docs.google.com/document/d/1yiisnsR7qg3XEEvch8vocWbitSUCZcoQ-pfzEVFg1eA/edit#heading=h.yi1cwrz4a79n

In this task, at least two implementations should be provided, to prove that the extension point works. e.g.:

• Allow Disk to be used by everyone
• Whitelist Disk to specific users