Operating System (OS)
A real time operating system is most likely to be used for which of the following task?

Ensuring that system clock works correctly on server
Controlling the fuel injection system of an automobile engines
Managing the access to system files in a laptop computers
Controlling access to a shared printer in a network

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Operating System (OS)
Semaphores

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

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