You have a server that runs Windows Server 2003 Service Pack 2 (SP2). You discover that the server has a large number of open connections that originate from the IP address 192.168.1.121. You need to identify the host name of the computer that uses the IP address 192.168.1.121. Which command should you run? （）

• A、Arp Ca  
• B、Netstat -r
• C、Net view //192.168.1.121  
• D、Ping Ca 192.168.1.121