Operating System (OS)
If you want to execute more than one program at a time, the systems software you are using must be capable of:

word processing
compiling
multitasking
None of these
virtual memory

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Operating System (OS)
The instruction register

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.
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

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