Operating System (OS)
All the time a computer is switched on, its operating system software has to stay in

floppy disk
disk drive
None of these
main storage
primary storage

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Operating System (OS)
A critical region is

a program segment that often causes unexpected system crashes
one which is enclosed by a pair of P and V operations on semaphores
a program segment where shared resources are accessed
none is the above
a program segment that has not been proved bug-free

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