Several users send documents to one printer, and the OS stores each job on disk and feeds them to the printer one at a time. What is this technique called?
Correct answer C. Spooling
Explanation
Spooling (simultaneous peripheral operations on-line) puts output for a device that can serve only one job at a time, such as a printer, into a disk queue. Each program finishes as if printing were done, while a spooler process sends the jobs in order. Caching keeps copies of data for faster access, and polling is repeatedly checking a device's status register.
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