Your company has a single Active Directory forest that has six domains. All DNS servers in the forest run Windows Server 2008 R2.You need to ensure that all public DNS queries are channeled through a single-caching-only DNS server. Which two actions should you perform？（）

• A、Disable the root hints.
• B、Enable BIND secondaries.
• C、Configure a forwarder to the caching DNS server.
• D、Configure a GlobalNames host (A) record for the hostname of the caching DNS server.