Operating System (OS)
...... controls the way in which the computer system functions and provides a means by which users can interact with the computer

The operating system
Application software
The motherboard
The platform

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Operating System (OS)
The Memory Buffer Register (MBR)

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.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
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".

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Operating System (OS)
The function(s) of the Storage Assignment is (are)

All of these
None of these
to assign storage to all temporary locations that are necessary for intermediate results.
to assign storage to all variables referenced in the source program.
to assign storage to literals, and to ensure that the storage is allocate and appropriate locations are initialized.

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