After a power outage, a Linux machine reboots but fails to mount all of its file systems. The file systems are unable to be mounted manually. Which of the following should be done FIRST?

A.
Reboot to runlevel 6.

B.
Run fsck on each file system and try to mount again.

C.
Reinstall the operating system.

D.
Edit /etc/fstab and correct any problems identified.