Your network contains an Active Directory forest named contoso.com. The functional level of
the forest is Windows Server 2008 R2. You have four Active Directory sites. Each site has
multiple Active Directory subnets.
You need to identify all of the authentication requests that originate from client computers
that are not associated to an Active Directory subnet.
What should you use?

A.
The System log

B.
The %Systemroot%\Debug\Netsetup.log log file

C.
The Authentication User Interface operational log

D.
The %Systemroot%\Security\Logs\Winlogon.log log file