If he uses the earliest due date first (EDD) priority rule to schedule these jobs, what will be the average job tardiness? O 2 hours O 1.5 hours 1.75 hours 2.25 hours if he uses the shortest processing time first (SPT) priority rule to schedule these jobs, what will be the average completion time? 0 7.5 hours O 3 hours 5 hours 25 hours If he uses the earliest due date first (EDD) priority rule to schedule these jobs, what will be the average job tardiness? O 2 hours O 1.5 hours 1.75 hours 2.25 hours if he uses the shortest processing time first (SPT) priority rule to schedule these jobs, what will be the average completion time? 0 7.5 hours O 3 hours 5 hours 25 hours