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

• A、Boot in maintenance mode 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， and reset the root password.