Operating System (OS)
The FIFO algorithm

executes first the job with the least processor needs
None of these
execute first the job that has been in the queue the longest
executes first the job that last entered the queue
executes first the job that first entered the queue

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Operating System (OS)
Round-robin scheduling

None of these
allows processor-bound tasks more time in the processor
allows interactive tasks quicker access to the processor
is quite complex to implement
gives each task the same chance at the processor

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

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