Theserveradministratordiscoversthataserver，whichhasnotbeenpatched，isrunningextremelyslowandsuspectsthattheservermayhavebeencompromised.Whichofthefollowing commandsshouldtheadministratorusetocheckthenumberofnetworkconnectionstheserveris making？（）
A.netstat
B.ping
C.nslookup
D.grep
参考答案：A
