Operating System (OS)
Supervisor state is

entered by programs when they enter the processor
required to perform any I/O
only allowed to the operating system
never used
None of these

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Operating System (OS)
Addressing structure

None of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these
defines the fundamental method of determining effective operand addresses
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)
Data encryption

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

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Operating System (OS)
Swapping

works best with many small partitions
allows many programs to use memory simultaneously
None of these
does not work with overlaying
allows each program in turn to use the memory

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