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)
Under virtual storage,

interprogram interference may occur
only the active pages of a program are stored in primary storage
None of these
a single program is processed by two or more CPUs
two or more programs are stored concurrently in primary storage

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