A disk group with four disks contains a two-column striped and mirrored volume.
Which step must be performed first to change the volume to have three columns without
losing the redundancy?

A.
use the vxassist command to relayout the volume

B.
use the vxrelayout command to relayout the volume

C.
use the vxassist command to convert the volume

D.
use the vxdg command to add two disks to the disk group