Operating System (OS)
A spooler is a

Program that coordinates the print job that are waiting to process
Queue of print job that are waiting to print
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

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Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

they are initially stored on disk
None of these
they are partly in primary memory and partly on disk
they are available on magnetic tapes
they are memory resident

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