Operating System (OS)
Data encryption

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

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Operating System (OS)
Addressing structure

performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
defines the fundamental method of determining effective operand addresses
All of these

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

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

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