Operating System (OS)
...... is used in operating system to separate mechanism from policy

Two level implementation
Single level implementation
Multi level implementation
None

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Operating System (OS)
A spooler is a

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

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