Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 （SP2）. You have two DNS servers named Server1 and Server2.  Server1 hosts an Active Directory-integrated zone for contoso.com. Server2 hosts a secondary zone for contoso.com. The serial number for the contoso.com zone is currently 985413. You need to verify whether Server2 has the most up-to-date version of the zone.  What should you do？（）

• A、On Server2， verify the properties of the start of authority （SOA） record.
• B、On Server2， verify the file properties of %systemroot%/system32/dns/contoso.com.dns.
• C、From Active Directory Sites and Services， view the NTDS Site Settings object.
• D、From Active Directory Replication Monitor， view the replication status of the DomainDNSZones partition.