Which of the following describes a primary difference between ext2 and ext3 filesystems?

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Which of the following describes a primary difference between ext2 and ext3 filesystems?
A . ext3 completely changed the tools needed for management of the disks.
B . ext3 includes journaling for the filesystem.
C . ext3 has no significant differences.
D . ext3 was primarily a bugfix update to ext2.

Answer: B