單項選擇題

Your network contains an Active Directory domain. The domain contains two domain controllers  named DC1 and DC2.  
DC1 hosts a standard primary DNS zone for the domain. Dynamic updates are enabled on the zone. DC2  hosts a standard secondary DNS zone for the domain.  
You need to configure DNS to allow only secure dynamic updates. 
What should you do first()

A.On DC1 and DC2, configure a trust anchor.
B.On DC1 and DC2, configure a connection security rule.
C.On DC1, configure the zone transfer settings.
D.On DC1, configure the zone to be stored in Active Directory.

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