Which of the following metrics provided by the iostat report is used to initially determine if a disk is I/O bound？（）

单项选择题WhichofthefollowingphrasesisTRUEregardingmonitoringdiskI Owithiostat？（）

A. The iostat can only be run as the root user
B. There could be zero percent I/O wait and still be an I/O bottleneck
C. Any I/O wait time displayed in output of "iostat" is an indication of severe I/O bottlenecks 
D. Running "iostat" without any arguments/parameters is sufficient for resolving I/O bottlenecks

单项选择题Whichofthefollowingtoolsshouldbeusedtodisplaythelocationofunusedphysicalpartitionsonadiskdrive？（）

A. df -k
B. lsps
C. lslv -p
D. fileplace

单项选择题Whichofthefollowingcommandswillonlyprovideasnapshotofaveragememoryusageforaprocess？（）

A. vmtune
B. ps au
C. iostat
D. rmss -m

单项选择题Whichofthefollowingcommandsshouldbeusedtomonitorthenumberofthreadsonthescheduler’srunqueueforanygiveninterval？（）

A. sar
B. pstat
C. iostat
D. filemon

单项选择题Whenmonitoringasystemusingvmstatwithaninterval，whichofthefollowingconclusionsshouldbedrawnaboutthemetricsunderpagepiandpagepo？（）

A. The values do not include working storage.
B. The values do not include persistent storage.
C. The values include both persistent and working storage.
D. The values are not working or persistent storage.