Operating System (OS)
The ability of an operating system to control the activities of multiple program at the same time is called

Multiprocessing
Multioperating
Multipaging
Multitasking

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Operating System (OS)
Addressing structure

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

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