A system administrator has determined that the /development filesystem needs to be changed from JFS to JFS2 to take advantage of the new capabilites available in JFS2. What is the method to convert the /development filesystem from type JFS to JFS2？（）

• A、Umount the /development filesystem and remount it using the following command： mount -t jfs2 /development
• B、Edit the /etc/filesystems file to change the type paramter to "jfs2" and change the log parameter to "jfs2log"
• C、Backup the /development filesystem data， delete the JFS /development filesystem， create the new JFS2 /development filsystem， and restore the data to the /development filesystem
• D、Backup the /development filesystem data， change the /development filesystem using the following command，chfs -t type=jfs2 /development.then， restore the data to the /development filesystem