You have a single Active Directory directory service domain. All user accounts in the sales   department are in an organizational unit （OU） named Sales. Your company has five public computers that are members of the domain. You notice a sales tracking application on one of the public computers. You verify that this application is assigned to users in the Sales OU through a Group Policy object （GPO）. You need to ensure that when sales department users log on to the public computers， the applications that are assigned to the Sales OU are not made available on the public computers.  What should you do？（）

• A、 Add the public computer accounts to a new OU. Create and link a GPO to enable the User Group Policy loopback processing mode setting in merge mode.
• B、 Add the public computer accounts to a new OU. Create and link a GPO to enable the User Group Policy loopback processing mode setting in replace mode.
• C、 Create a new GPO and link it to the Sales OU to enable the User Group Policy loopback processing mode setting in merge mode.
• D、 Create a new GPO and link it to the Sales OU to enable the User Group Policy loopback processing mode setting in replace mode.