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

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

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Operating System (OS)
Data encryption

cannot be used by private installations
None of these
is not necessary, since data cannot be intercepted
is mostly used by public networks
is mostly used by financial networks

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