Operating System (OS)
In MS-DOS, relocatable object files and load modules have extensions

.COM and .OBJ, respectively
.EXE and .OBJ, respectively
None of these
.DAS and .EXE, respectively
.OBJ and .COM or .EXE, respectively

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Operating System (OS)
The Memory Address Register

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".
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.

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