Operating System (OS)
Data encryption

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

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Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

they are memory resident
they are initially stored on disk
they are available on magnetic tapes
None of these
they are partly in primary memory and partly on disk

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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
All of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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