【单选题】
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.
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