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

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

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Operating System (OS)
A spooler is a

Location in memory that maintains the contents of documents until it prints
Program that coordinates the print job that are waiting to process
Queue of print job that are waiting to print
Message sent from the printer to the operating system when a print job is completed

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