our company has a single active directory forest that has six domains. All DNS servers in the forest run windows serve 2008. You need to ensure that all public DNS queries are channeled though 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.