单项选择题

A. The Volume Groups must be changed with chvg -E vgname.
B. The Volume Groups must be a member of a resource group and must be varied on al nodes of       the cluster.
C. The Volume Groups must be a member of a resource group and must be varied off all nodes      of the cluster.
D. The Volume Grups cannot be changed to enhanced concurrent capable because they must be      recreated with mkvg -C vgname.