单项选择题An administrator needs to apply a Technology Level update. During the preview install, the output indicates that there is insufficient space in the usr filesystem. Review of the root volume group indicates there are no available physical partitions, but the test jfs2 filesystem is only 8% used. What is the most efficient method to use the available space in the test filesystem to apply the update?()
A.Use chfs to reduce the /test filesystem
B.Use cplv to copy the /test filesystem to a smaller logical volume
C.Use migratepv l to move the /test filesystem to a different volume group
D.Backup the /test filesystem, remove it, and recreate it with a smaller size