Your network consists of a single Active Directory domain. All domain controllers run Windows Server  2008 R2.  The Audit account management policy setting and Audit directory services access setting are enabled for  the entire domain.  You need to ensure that changes made to Active Directory objects can be logged. The logged changes  must include the old and new values of any attributes.  What should you do（）

• A、Enable the Audit account management policy in the Default Domain Controller Policy.
• B、Run auditpol.exe and then configure the Security settings of the Domain Controllers OU.
• C、Run auditpol.exe and then enable the Audit directory service access setting in the Default Domain  policy.
• D、From the Default Domain Controllers policy， enable the Audit directory service access setting and  enable directory service changes.