You have a single Active Directory domain. AlI 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 You need to ensure that outdated DNS records are automatically removed from the DNS zone.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， enable scavenging.
• B、From the properties of the zone， disable dynamic updates.
• C、From the properties of the zone， modify the TTL of the SOA record.
• D、From the command prompt， run ipconfig /flushdns.