Installed on the original IBM PCs, ____ used a command-line interface that simply displayed a "prompt" such as C:\ on the screen and waited for users to type commands.

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DOS, or Disk Operating System, was the primary operating system used on IBM PCs in the 1980s and early 1990s. It featured a command-line interface where users could type in text commands, and it displayed a prompt like C:\ to indicate where the user could enter commands. HTML is a markup language used for creating web pages, while Unix and Linux are both operating systems that use a command-line interface, but were not originally installed on IBM PCs.

Installed on the Original IBM PCs, ____ Used a Command-Line