During reboot the system hangs with an LED 0554 message that means， "The boot device could not be opened or a read failed." What recovery procedures should be taken？（）

• A、Boot in maintenance and use fsck to check hd5.
• B、Boot in maintenance mode， access the rootvg and check the /etc/inittab for corruption.
• C、Boot in maintenance mode， access the rootvg and rebuild the boot image using the bosboot command.
• D、Boot in maintenance mode， access the rootvg and use the bootlist command to create a valid boot list.