Which of the following commands should be used to observe the number of system calls per second? （）

AllofthefollowingtypesofstatisticsarereportedbytheiostatcommandtoolEXCEPT:（）.

A. Free memory
B. CPU statistics 
C. Disk statistics 
D. Terminal statistics

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To examine the Exhibit, press the Exhibit button. Which option would produce this output from the errpt command? （）

A. errpt -t 
B. errpt -a 
C. errpt -D 
D. errpt

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