Correct Answer: single user operating system

Solution : The correct option is single user operating system.

The IBM-DOS (IBM Disc Operating System) operating system is a single-user operating system. These operating systems were primarily intended for single-user desktop and small-scale computer settings. IBM-DOS was a command-line operating system that supported basic file management and programme execution. It lacked built-in support for multitasking or multi-user capability, making it best suited for single users working on home computers.