Your company has two offices. The network consists of a single Active Directory domain. You have two domain controllers named DC2 and DC3. All servers run Windows Server 2003 Service Pack 2 （SP2）.You verify the IP configuration of Server1 as shown in the following Command Prompt window. You need to ensure that Server1 can locate a domain controller if a single server fails.  Which IP configuration should you change on Server1？（）

• A、Add 10.10.0.2 as a DNS server.
• B、Add 10.10.0.2 as a WINS server.
• C、Add 10.11.0.20 as a WINS server.
• D、Add a second network adapter that has an IP address of 10.10.0.20.