Your network consists of an Active Directory forest that contains one domain. All domain   controllers run Windows Server 2008 R2 and are configured as DNS servers. You have an Active  Directory- integrated zone.     You have two Active Directory sites. Each site contains five domain controllers.     You add a new NS record to the zone. You need to ensure that all domain controllers immediately receive the new NS record.     What should you do（）

• A、From the DNS Manager console， reload the zone.
• B、From the Services snap-in， restart the DNS Server service.
• C、From the command prompt， run repadmin /syncall.
• D、From the DNS Manager console， increase the version number of the SOA record.