You have a server named Server1 that runs Windows Server 2003 Service Pack 2 （SP2）.  Server1 runs an application named App1. All client computers run Windows XP Professional Service Pack 3 （SP3）. Users from a remote network segment report poor performance when they run App1. You need to identify whether the cause of the poor network performance is packet loss.  Which tool should you use？（）

• A、Netcap.exe
• B、Netstat.exe
• C、Pathping.exe
• D、Tracert.exe