Which of the following best describes multitasking in computing?

Multitasking in computing refers to the ability of a processor to execute multiple tasks or programs simultaneously. This capability allows a computer to appear as if it is performing several operations at the same time, enhancing efficiency and user experience.

In a multitasking environment, the operating system quickly switches between tasks, allocating processor time to each one, so they seem to run concurrently. This is particularly important for complex applications or when executing background processes while the user is actively interacting with the system.

The other options describe different scenarios that do not encapsulate the essence of multitasking. Running a single program at a time indicates a single-task environment. Running multiple programs sequentially suggests that each program waits for the previous one to complete before starting, which is not multitasking but rather a form of time-sharing. Finally, running no programs at all does not involve multitasking, as multitasking inherently requires the execution of at least one program.