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What is a common reason for this message?

After running the command umount /mnt, the following error message is displayed:
umount: /mnt: device is busy.
What is a common reason for this message?

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A.
The kernel has not finished flushing disk writes to the mounted device.

B.
A user has a file open in the /mnt directory.

C.
Another file system still contains a symlink to a file inside /mnt.

D.
The files in /mnt have been scanned and added to the locate database.

E.
The kernel thinks that a process is about to open a file in /mnt for reading.


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