Operating System (OS)
The Memory Address Register

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 group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.
is a hardware memory device which denotes the location of the current instruction being executed.
None of these

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Operating System (OS)
Data encryption

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

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