Which of the following commands should be used to check whether a system dump is valid and readable?（）

Ifasystemadministratorwantstoshowonlyadiskreportfordisk...

单项选择题If a system administrator wants to show only a disk report for disk2, at two second intervals, what is the correct command to run?（）

Whichiostat%iowaitminimumthresholdindicatesapossibleI/O...

单项选择题Which iostat %iowait minimum threshold indicates a possible I/O bottleneck?（）

Whichcommandrecordsthepathtakenbynetworkpacketsbetweena...

单项选择题Which command records the path taken by network packets between a source and destination system? （）