Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

branches off to the interrupt service routine immediately
halts for a predetermined time
hands over control of address bus and data bus to the interrupting device
branches off to the interrupt service routine after completion of the current instruction
None of these

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Operating System (OS)
The FIFO algorithm

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

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