Operating System (OS)
Addressing structure

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

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Operating System (OS)
System maintenance:

is necessary on all systems, regardless of how good
None of these
always requires several programs
is usually not necessary
is not required if the system is well written

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