Your network consists of Windows XP computers. All computers are joined to a single Active Directory directory service domain and located in a single Active Directory site. You create a new Group Policy object （GPO） and link it to the site. The policy configures default screensaver settings. User accounts of users in the research department are located in an organizational unit （OU） named Research. You need to allow users in the research department to configure a different screensaver setting on their computers. What should you do？（）

A. Move the user accounts of users in the research department to the Users container.
B. Configure a local security policy on all computers in the research department to allow users to modify their screensaver settings.
C. Add users in the research department to a domain group. Allow the group the Apply Group Policy permission for the GP
D. Add users in the research department to a domain group. Deny the group the Apply Group Policy permission to the GP