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.