Operating System (OS)
Addressing modes

All of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
defines the fundamental method of determining effective operand addresses
None of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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

to assign storage to all temporary locations that are necessary for intermediate results.
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 variables referenced in the source program.
None of these

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