The 'tee' command is the right choice for this task because it reads from standard input and writes to both standard output (allowing the user to see the output on the screen) and one or more files, essentially duplicating the output stream. The operator > is used to redirect output to a file but does not display it on the screen. The operator | is used to pipe the output of one command to another but on its own does not write to a file. The operator >> is used to append output to a file but again, it does not display the output on the screen.