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單項選擇題

You created a snapshot of the /data2 filesystem as follows:  
# fssnap -F ufs -o bs=/data2/snap /data2  
But, the system responds with the following error: snapshot error: Invalid backing file path  
What is the problem? ()

A. The /data filesystem does not exist.
B. This message indicates that the /data2/snap directory does not exist.
C. The name of the Backing Store is incorrect, it should be /dev/fssnap/0
D. This message indicates that you cannot have the backing store file on the same filesystem as the filesystem being snapped.

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