单项选择题 In AIX Version 5.3， a system administrator wants to create a bootlist for normal bootups from a file named /bootlist.norm. Which of the following is the proper command to accomplish this？（）

单项选择题 An administrator is ordering a new Power 550. They will mirror rootvg and are concerned about single points of failure. Which of the following features should be ordered？（）

单项选择题 Following a system boot，the display indicates that previously detected hardware is missing.  Which of the following commands would identify the missing hardware？（）