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

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

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Operating System (OS)
Thrashing can be avoided if

All of these
the pages, belonging to the working set of the programs, are in main memory
None of these
the speed of I/O processor is increased
the speed of CPU is increased

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