Operating System (OS)
Daisy chain is a device for

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

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Operating System (OS)
A critical region is

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

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