What type of desktop system is Sarah using in the following scenario? Sarah types the phrase "Open Document 3" onto a black screen, and the computer responds by opening the file she requested. direct user interface indirect user interface command-line interface graphical user interface

I'd go with command-line interface.

A CLI enables users to type commands in a console or a terminal window expressed as a sequence of characters and presses the enter key on the keyboard to execute that command. And in this case, Sarah is typing an "open document 3" command to the command-line interface to open a file in her computer.