Operating System (OS)
A critical region is

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

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Operating System (OS)
Daisy chain is a device for

None of these
connecting a number of devices to a controller
connecting a number of controllers to a device
interconnecting a number of devices to a number of controllers
All of these

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