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？ （）