The correct answer is: B. mv
The mv command is used to move or rename files and directories. To rename a file, use the following syntax:
mv old_name new_name
For example, to rename the file foo.txt to bar.txt, you would use the following command:
mv foo.txt bar.txt
The mv command can also be used to move files from one directory to another. To do this, use the following syntax:
mv file_name directory_name
For example, to move the file foo.txt to the directory /tmp, you would use the following command:
mv foo.txt /tmp
The mv command is a powerful tool that can be used to manage files and directories. It is important to understand how to use the mv command correctly to avoid accidentally deleting files.
The other options are incorrect because they do not rename files. The ren command is not a valid command in UNIX. The remove command is used to delete files. The change command is not a valid command in UNIX.