For which of the following can the tee command be used?

The `tee` command does not have functionality to reverse the order of file contents; commands like `tac` or `rev` are used for that.

Using command output as arguments for another command is typically achieved with backticks or `$(...)`, not the `tee` command.

Adding line numbers to command output is usually done with commands like `nl` or `cat -n`.

Piping the output of one command into the input of another is the general function of the `|` (pipe) operator, not specifically the `tee` command itself.

The `tee` command reads standard input and writes it to standard output (typically the screen) while also redirecting a copy of that same output to a file or multiple files, acting like a T-junction for data streams.