Which sar option generates real-time disk I/O statistics?（）

To examine the Exhibit, press the Exhibit button. A user is compiling a C program.  A performance problem occurs and  vmstat 120 10  is run to determine the cause.  The vmstat output is provided in the exhibit.  Which of the following commands should be run to obtain more information about the problem?（）

A. lsps 
B. tprof 
C. iostat 
D. vmtune

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Whichofthefollowingkdbcommandsisusedtoobtainastacktracefromadump?（）

A. trb 
B. his 
C. f 
D. trace

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