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.