What is SPOOL?
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A mechanism to connect to printer, keyboard and monitor in Unix
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A mechanism to share printer across users
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A request made by the device to unix kernel
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None
SPOOL (Simultaneous Peripheral Operations On Line) is a queuing mechanism that allows multiple users to share printer resources by spooling print jobs to disk. This prevents conflicts when several users print simultaneously, as jobs are processed sequentially from the queue.
SPOOL (Simultaneous Peripheral Operations On-Line) is a mechanism that queues print jobs from multiple processes/users so they can share a single printer without their output interleaving or colliding — each job's data is buffered to disk and printed in turn. It isn't a generic device-connection mechanism or a kernel-level request type, which is why the other options don't fit.