How to remove shutdown, restart, sleep and hibernate options from start menu?

Run gpedit.msc -> User Configuration -> Administrative Templates -> Startup Menu and Taskbar -> Edit policy setting to Enable "Remove and prevent access to the Shut Down, Restart, Sleep, and Hibernate commands" -> Done! :)

How to disable sleep option?

Run gpedit.msc -> Computer Configuration -> Administrative Templates -> System -> Power Management -> Sleep Settings -> Edit policy setting to Enable "Turn Off Hybrid Sleep (Plugged In) and (On Battery)" ->  Edit policy setting to Disable "Allow Standby States (S1-S3) when sleeping (Plugged In) and (On Battery)" -> Done! :)