Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

swapping a process to the disk
None of these
suspending some of the processes when the CPU load is high
bring processes from the disk to the main memory
assigning ready process to the CPU

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

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

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