Your network consists of a single Active Directory domain. All domain controllers run Windows  Server 2008 R2.     Auditing is configured to log changes made to the Managed By attribute on group objects in an  organizational unit named OU1.   You need to log changes made to the Description attribute on all group objects in OU1 only.     What should you do（）

• A、Run auditpol.exe.
• B、Modify the auditing entry for OU1.
• C、Modify the auditing entry for the domain.
• D、Create a new Group Policy object （GPO）. Enable the Audit account management policy setting link the GPO to OU1.