Operating System (OS)
What are the two types of Semaphore?

Counting Semaphores and Binary Semaphores
Digital Semaphores and Binary Semaphores
Analog Semaphores and Octal Semaphores
Critical Semaphores and System Semaphores

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Operating System (OS)
Which of the following statement is true.

All of these
Thrashing is a natural consequence of virtual memory systems.
Seek analysis is used for analysing control-unit busy problems.
None of these
The LRU algorithm pages out pages that have been used recently

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