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Consider a system with 13 dedicated devices of the same type and all jobs currently

running on this system require a maximum of three devices to complete their

execution but they each run for long periods of time with just two devices and

request the remaining one only at the very end of the run. Assume that the job

stream is endless and that your operating systemà ƒ ƒ ¢ € ™s device allocation policy is a very

conservative one: No job will be started unless all the required drives have been

allocated to it for the entire duration of its run.

a. What is the maximum number of jobs that can be in progress at once? Explain

your answer.