Operating System (OS)
Semaphores

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

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Operating System (OS)
Daisy chain is a device for

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

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