Operating System (OS)
Addressing structure

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
All of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
None of these

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Operating System (OS)
Object code

is ready to execute
is the output of compilers, but not assemblers
must be rewritten before execution
None of these
must be "loaded" before execution

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