You have a DNS server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). You create a primary zone on Server1 for contoso.com.You run the DNS simple query test and recursive query test. The simple query test completes successfully, but the recursive query test fails.You need to ensure that the recursive query test can complete successfully.  What should you do on Server1? （）

• A、Clear the cache. 
• B、Disable recursion. 
• C、Enable access to the Internet. 
• D、Configure a reverse lookup zone.