Operating System (OS)
Addressing structure

All of these
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.

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Operating System (OS)
Memory

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

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Operating System (OS)
Data encryption

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

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