Operating System (OS)
Daisy chain is a device for

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

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Operating System (OS)
Semaphores

synchronize critical resources to prevent contention
synchronize critical resources to prevent deadlock
None of these
are used to do I/O
are used for memory management

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