单项选择题 Your network contains an Active Directory domain named contoso.com.  You remove several computers from the network.   You need to ensure that the host （A） records for the removed computers are automatically deleted from  the contoso.com DNS zone.  What should you do（）

单项选择题 You have an Active Directory domain named contoso.com.   You have a domain controller named Server1 that is configured as a DNS server.   Server1 hosts a standard primary zone for contoso.com. The DNS configuration of Server1 is shown in  the exhibit. （Click the Exhibit button.）   You discover that stale resource records are not automatically removed from the contoso.com zone.   You need to ensure that the stale resource records are automatically removed from the contoso.com  zone.   What should you do（）

单项选择题 Your network contains a domain controller that is configured as a DNS server. The server hosts an  Active Directory-integrated zone for the domain.   You need to reduce how long it takes until stale records are deleted from the zone.  What should you do（）