The system administrator has determined that a new JFS log needs to be created on a different disk， in order to decrease an I/O bottleneck. Which of the following steps are the most correct？（）

A. mklv -t jfslog -y LVname VGname 1 PVname logform /dev/LVname chfs -a log=/dev/LVname /filesystemname m ount and unmount filesystem
B. mklv -t jfslog -y LVname VGname PVname unmount filesystem vi /etc/filesystems， change entry for lv to point filesystem to new JFS log mount filesystem
C. mklvcopy -a jfslog -y LVname VGname 1 PVname chfs -a log=/dev/LVname /filesystemname unmount and mount file system
D. mklvcopy -t jfslog -y LVname VGname 1 PVname logform /dev/LVname vi /etc/filesystems， change entry for lv to point filesystem to new JFS log unmount and mount filesystem