Exercise 3: An fstab Line for UUID 9a8b-7c6d Mounted as ext4 at /data — Possible Solution
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UUID=9a8b-7c6d  /data  ext4  defaults  0  2

Explanation:

This follows the chapter's own exact fstab line structure and field
order, with the exercise's own specific UUID and mount point
substituted in. Each field, per the chapter's own explanation:

1. UUID=9a8b-7c6d -- the device itself, identified by its UUID rather
   than a device name like /dev/sda1, specifically because a UUID
   stays consistent even if the underlying device name shifts between
   boots (e.g. if a drive is added or removed, changing which letter
   gets assigned).

2. /data -- the mount point, the specific location in the directory
   tree where this filesystem's own contents become accessible, per
   the exercise's own requirement.

3. ext4 -- the filesystem type, telling the kernel which driver to
   use to actually interpret this partition's own structure.

4. defaults -- the mount options; "defaults" is the standard,
   unremarkable choice covering typical read-write mounting behavior
   with no special flags.

5. 0 -- the dump backup flag, historically used by the legacy dump
   utility to decide whether this filesystem should be backed up;
   0 means "don't."

6. 2 -- the fsck check order, telling the boot-time filesystem
   checker what priority to check this filesystem in; 1 is reserved
   for the root filesystem, and 2 is the standard value for
   everything else that should still be checked.

WHY THIS WORKS AS AN ANSWER
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This builds a correctly structured fstab line using the chapter's own
UUID-based device identification and standard field values, then
explains each of the six fields individually rather than treating the
line as an unexplained template.