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

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

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Operating System (OS)
The term "operating system" means

the way a floppy disk drive operates
conversion of high level language into machine code
a set of programs which controls computer working
the way a computer operator works
None of these

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