Operating System (OS)
Data encryption

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

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Operating System (OS)
The instruction register

contains the address of the memory location that is to be read from or stored into.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
is a hardware memory device which denotes the location of the current instruction being executed.
None of these
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

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