You have a single Active Directory directory service domain. You use a Group Policy object （GPO） to apply security settings to your client computers. You configure the startup type for system services settings in a new GPO， and you link the GPO to an organizational unit （OU）.  You discover that the startup type for system services on one of the client computers has not been updated. You need to ensure that the Group Policy settings are applied to the client computer. What should you do？（）

• A、  Restart the client computer.
• B、 Instruct the user to log off and then log on to the client computer.
• C、 On the client computer， run the Gpupdate.exe command with the /Force parameter.
• D、 On the client computer， run the Gpupdate.exe command with the /Target：computer parameter.