Operating System (OS)
An instruction in a programming language that is replaced by a sequence of instructions prior to assembly or compiling is known as

label
macro
literal
procedure name
None of these

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Operating System (OS)
Data encryption

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

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Operating System (OS)
The Memory Address Register

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

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