Operating System (OS)
All the time a computer is switched on, its operating system software has to stay in

primary storage
main storage
None of these
disk drive
floppy disk

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Operating System (OS)
Addressing structure

are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
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

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