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All the time a computer is switched on, its operating system software has to stay in

  • A.main storage
  • B.primary storage
  • C.floppy disk
  • D.disk drive

Answer: B

Correct answer: primary storage

The parts of the operating system that must respond at any moment - the interrupt handlers, the scheduler, the memory manager - have to be in primary storage the whole time the machine is running, since the processor can only execute what is in memory. Less-used routines may be left on disk and fetched when needed.

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