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

None of these
allow people to sue the computers
keep system programmers employed
make computer easier to use
make the most efficient use of the hardware

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Operating System (OS)
Multiprogramming systems:

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

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