Examine the screenshot below. What is the significance of the first user account listed in the "Groups or user names" window of the security tab of the Super Important Stuff Properties?

The folder Super Important Stuff was deleted and the privileges for the account starting with SID S$-1-5-21-2866215164$ were revoked.

The user account "Account Unknown" is malicious and should be investigated.

The SID of the account indicates that the user is remote and has authenticated with the domain controller.

A local user account that was previously assigned rights and privileges to the folder was deleted from the system.