Which of the following commands should be used to determine which disk of a system is experiencing a disk I/O performance problem？（）

A. installp -D
B. installp -d
C. installp -C
D. installp -c

A. errpt -a
B. errpt -l
C. errdemon -l
D. syslogd -r

A. Network access and availability
B. Application access and availability
C. Escalation and conflict resolution
D. Headcounts and budgets