You are the network administrator for the Beijing office of TestKing. A branch office is located in Cairo. The DNS servers in both locations run Windows Server 2003. The network uses two DNS namespaces internally. They are named publishing.testking.com and testking.com. The locations of the primary name servers are shown in the following table. The Beijing office contains some servers that are registered in the testking.com zone and other that are registered in the publishing.testking.com zone. All computers in the Beijing office are configured to use the local DNS server as their preferred DNS server. The two offices are connected only by using a VPN through the Internet. Various network problems occasionally result in loss of connectivity between the two offices. Firewalls prevent the DNS servers in both offices from receiving queries from the Internet. You need to configure the DNS server in the Beijing office to allow successful resolution of all queries from the Beijing office for names in the publishing.testking.com namespace, even when the VPN link between the Beijing and Cairo offices fails. What should you configure on the DNS server in the Beijing office?（）