You have a single Active Directory domain. All domain controllers run Windows Server 2008 and are configured as DNS servers. The domain contains one Active Directory-integrated DNS zone. You need to ensure that outdated DNS records are automatically removed from the DNS zone.
What should you do?
A.
From the properties of the zone, modify the TTL of the SOA record.
B.
From the properties of the zone, enable scavenging.
C.
From the command prompt, run ipconfig /flushdns.
D.
From the properties of the zone, disable dynamic updates.
B is correct answer
B , any outdated dns source to be removed need to use scavenging