Operating System (OS)
Scissoring enables

a part of data to be displayed
no data to be displayed
full data display on full area of screen
None of these
entire data to be displayed

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Operating System (OS)
The instruction 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
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.

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