An administrator is moving a volume group from one server to another. The disks will be physically moved between the two systems. <br /> Which two operations are required on the volume group prior to the physical disk switch?()
A、‘varyoffvg’ and ‘exportvg’
B、‘varyofflv’ and ‘importvg’
C、‘varyofflv’ and ‘migratepv’
D、‘varyoffvg’ and ‘migratevg’