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

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

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Operating System (OS)
Multiprogramming systems:

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

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