[单项选择]An administrator has mirrored the root volume group to a second disk， but ’bootlist’ is failing to correctly add the second disk. What is the likely cause of the problem？（） A. The administrator has failed to run ’bosboot -ad <2nd disk>’ prior to the bootlist command. B. The administrator has failed to run ’bootinfo -B <2nd disk>’ prior to the bootlist command. C. The administrator has failed to run ’mirrorvg -m rootvg <2nd disk>’ prior to the bootlist command. D. The administrator has failed to run ’bosboot -ad /dev/ipldevice <2nd disk>’ prior to the bootlist command.
