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On a system using non-preemptive scheduling, processes with expected run times of 5, 18, 9 and 12 are in the ready queue. In what order should they be run to minimize wait time?
(A) 5, 12, 9, 18
(B) 5, 9, 12, 18
(C) 12, 18, 9, 5
(D) 9, 12, 18, 5
nan