About command ‘# mv abc xyz’, which statement is wrong:
A. If abc is a normal file and xyz doesn't exist before, then this command will change the file name abc to xyz.
B. If abc is a normal file and xyz is a directory, this command will move file abc into directory xyz.
C. If abc is a directory and xyz is also a directory, this command will make abc to be the subdirectory of xyz.
D. If abc is a directory and xyz is a normal file, this command will overwrite xyz, i.e. xyz will lost.
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