Single-user operating system:

A single-user operating system is designed to be used by only one user at a time. It provides a platform for running applications and managing resources on a personal computer or workstation. In a single-user operating system, the user has exclusive access to the system's resources and can perform various tasks without interference from other users.

Among the options provided, the correct answer is option 'C' - MS-DOS, which stands for Microsoft Disk Operating System. MS-DOS is a single-user operating system that was widely used on IBM-compatible personal computers during the 1980s and 1990s. It was the dominant operating system before the advent of Windows.

Explanation:

MS-DOS was developed by Microsoft and initially released in 1981. It was a command-line based operating system that provided a simple interface for users to interact with the computer. MS-DOS supported a wide range of applications and allowed users to perform tasks such as file management, running programs, and accessing hardware devices.

When a user booted a computer with MS-DOS, they would be presented with a command prompt where they could enter commands to perform various operations. MS-DOS did not have a graphical user interface (GUI) like modern operating systems, but it was efficient and widely used for its simplicity and compatibility with a wide range of hardware.

Unlike Windows and macOS, which are multi-user operating systems that support multiple users simultaneously, MS-DOS was designed to be used by a single user. It did not have built-in support for user accounts or privileges, and all actions performed on the system were attributed to the logged-in user.

Conclusion:

In conclusion, MS-DOS is a single-user operating system that was widely used on personal computers during the 1980s and 1990s. It provided a command-line interface for users to interact with the system and perform various tasks. MS-DOS did not support multiple users simultaneously and did not have built-in user account management.