单项选择题

Asystemadministratorhasdeterminedarootmirroreddisk，hdis……

A system administrator has determined a root mirrored disk， hdisk1， needs to be replaced. The root volume has been unmirrored. What is the next step to remove the disk drive？（）

A.cfgmgr
B.rmdev -d hdisk1 -l
C.reducevg rootvg hdisk1
D.have the IBM CE replace the disk

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