What is a Checkpoint in Hyper-V?

An automatically-created saved position should the virtual machine crash

A position you can roll back to during the creation of a virtual machine

A saved position, like System Restore, that you can roll back to

A The last-saved configuration of a virtual machine

Why would you want to take ownership of files?

Because another user has logged-in, since the user last used the PC

Because deleted and recovered files cannot be accessed

Because you've removed a user account from the PC, but another user needs to access the files

Because you've moved a user's files to network storage