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

Application software
The platform
The motherboard
The operating system

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

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

flexibility to the users in running lists of commands by simply collecting them in named batch command files
the command set being common across different hardware configurations
users can create system programs and run them as commands
None of these
the processing is much faster than would other-wise be the case when user defined commands are used

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