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".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
contains the address of the memory location that is to be read from or stored into.

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

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

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