The client computers in your network run either Windows XP or Windows 7. All client computers are in a single Active Directory Domain Services (AD DS) organizational unit (OU) named MyClients.
You install Windows Software Update Services (WSUS). You create a Group Policy object (GPO) that enables automatic updates from the WSUS server, and you link the GPO to the MyClients OU. You place all client computers in a targeting group named MyClients.
Testing reveals that a security update that is applicable to both Windows XP and Windows 7 causes a line- of-business application to fail on the Windows XP client computers.
You need to ensure that the application runs on the Windows XP client computers and that the Windows 7 client computers receive the security update.
What should you do?
Correct Answer: D
Explanation/Reference:
Explanation:
All computers targeting group = assigned group and unassigned group.
Unassigned computer targeting group = all computer which is not assign to any group.

hints:
Windows 7 remove from MyClients = unassigned computer targeting group
Windows XP = MyClients targeting group
update will only done for unassigned computer targeting group