Your network consists of a single Active Directory domain named contoso.com. All servers run Windows Server 2003 Service Pack 2 （SP2）.  The domain has two domain controllers named DC1 and DC2. Both domain controllers are DNS servers. Windows Support Tools is installed on both domain controllers. The contoso.com DNS zone is Active Directory-integrated. You need to verify that the contoso.com zone has replicated between DC1 and DC2.  What should you do？（）

• A、On DC1 and DC2， open Event Viewer and review the DNS server log.
• B、On DC1， open the DNS snap-in. From the properties of the contoso.com zone， review the Zone Transfer settings.
• C、On DC1 and DC2， open the DNS snap-in. From the properties of the contoso.com zone， review the Monitoring settings.
• D、From Active Directory Replication Monitor， connect to DC1. Under the DC=DomainDnsZones，DC=contoso，DC=com directory partition， review the status of Default-First-Site/DC2.