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

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

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Operating System (OS)
Memory management is :

critical for even the simplest operating systems
None of these
not used on multiprogramming systems
not used in modern operating system
replaced with virtual memory on current systems

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