单项选择题 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？ （）

单项选择题 Your company’s network has client computers that run Windows 7.    When a user attempts to log on to the domain from a computer named Client1，she receives the following message：   The system cannot log you on to this domain because the system’s computer account in its primary domain is missing or the password on that account is incorrect.  You need to ensure that the user can log on to the domain from Client1.   What should you do？（）

单项选择题 Your network consists of 1，000 client computers that run Windows XP. The computers do not have access to the Internet.   You plan to migrate 200 of the computers immediately to Windows 7. The remainder will be migrated over the next several months.   You need to plan the most efficient method for activating all of the computers.   What should you do？（）