A system is experiencing name resolution issues.  The administrator has verified that /etc/resolv.conf is suitably configured using correct syntax. However， processes run by non-root users are failing to resolve any hostnames to IP addresses with the error ’No response from server’.  Which tool will help trace the nslookup command in an attempt to investigate the problem？（）  

• A、kdb
• B、dbx
• C、trace
• D、truss