While editing a file in vi, an administrator realizes that the wrong file is being changed. Which of the following vi command sequences will allow the administrator to quit without saving any changes?

:Q! uses an uppercase Q which is not a valid vi quit command - vi commands are case-sensitive and :Q! will produce an error.

:q! is the standard vi command to quit without saving - the colon enters command-line mode, q instructs vi to quit, and the exclamation mark forces the quit even when unsaved changes exist. This is the definitive method to discard edits and exit the editor immediately.

:w! writes and saves the current buffer to disk but does not exit the editor.

:wq! writes the file and then quits, which saves the unwanted changes rather than discarding them.