Operating System (OS)
The primary purpose of an operating system is:

To make computers easier to use
To keep systems programmers employed
To allow people to use the computer
To make the most efficient use of the computer hardware

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Operating System (OS)
Multiprogramming systems:

are used only on large mainframe computers
are easier to develop than single programming system
execute more jobs in the same time period
None of these
execute each job faster

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