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.