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（）