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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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