Operating System (OS)
Data encryption

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

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Operating System (OS)
A program

is a sequence of instructions
is a device that performs a sequence of operations specified by instructions in memory.
None of these
is the device where information is stored
is typically characterized by interactive processing and time of the CPU

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