Operating System (OS)
Data encryption

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

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Operating System (OS)
Addressing structure

defines the fundamental method of determining effective operand addresses
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.
All of these

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