An operating system that allows a single user to work on two or more programs at the same time is what type of OS?

Explanation:

The correct answer is none of these

An operating system that allows a single user to perform only one task at a time is called a Single-User Single-Tasking Operating System. Functions like printing a document, downloading images, etc., can be performed only one at a time. Examples include MS-DOS, Palm OS, etc.

Advantage: This operating system occupies less space in memory.

Disadvantage: It can perform only a single task at a time.

There are four types of operating systems −

Real-time operating system

Single-User/Single-Tasking operating system

Single-User/Multitasking operating system

Multi-User/Multitasking operating system

Real-time operating system is designed to run real-time applications. It can be both single- and multi-tasking. Examples include Abbasi, AMX RTOS, etc.

An operating system that allows a single user to perform more than one task at a time is called Single-User Multitasking Operating System. Examples include Microsoft Windows and Macintosh OS.

It is an operating system that permits several users to utilize the programs that are concurrently running on a single network server. The single network server is termed as "Terminal server". "Terminal client" is a software that supports user sessions. Examples include UNIX, MVS, etc.