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（）

A. Set the scavenging period of Server1 to 0 days.
B. Modify the Server Aging/Scavenging properties.
Configure the aging properties for the contoso.com zone.
D. Convert the contoso.com zone to an Active Directory-integrated zone.