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