You are the administrator of a Windows 2000 network. The network consists of a Windows 2000 domain named Company.com. You install Windows 2000 Professional on a new computer named ES1 and configure the TCP/IP settings to have a static IP address. You plan to join ES1 to the Company.com domain. You configure two DNS server addresses in the TCP/IP properties. The first DNS server address is for a DNS server hosted by your ISP, the second DNS server address is for a DNS server authoritative for the Company.com domain. When you attempt to join ES1 to the domain, you are unable to do so. You can successfully PING the IP address of each DNS server from ES1. You want ES1 to be able to join the Company.com domain. What should you do?（）

• A、Delete the second DNS server entry.
• B、Delete the first DNS server entry.
• C、Add an A （host） record for the computer to the appropriate DNS zone.
• D、Configure the computer to Obtain an IP address automatically.