FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Explanation: The single-user operating system is the operating system in which only one user can access the computer system at a time, and Ms-DOS is the best example of a single-user operating system.

Detailed explanation-2: -OS/2 is a series of computer operating systems, initially created by Microsoft and IBM. It doesn’t provide multi-user facility. So, Option (D) is correct.

Detailed explanation-3: -A single-user operating system is a type of operating system that allows a user (single user) to perform only one task at a time. The single-user operating system is developed to be used on a single system and to provide security to the user.

Detailed explanation-4: -Multi-user operating system is a computer operating system(OS) that allows multiple users on different computers or terminals to access a single system with one OS on it. Examples of multi-user operating system are : Linux, Ubuntu, Unix, Mac OS X, Windows 1010 etc.