4. Requests for solutions to billing-related IT problems have been received. Six of those jobs were assigned to Joel Williams, one of the support specialists. Joel has latitude in deciding the order in which these requests will be processed, but his performance is evaluated in terms of turnaround times or flow times. All jobs are equally important. Try the following rules: FCFS, SPT, EDD, and CR. Requests will start being processed after the last one's arrival, that is, 68 minutes. a. Help Joel find the sequence that will minimize flow time based on the following data. b. Help him find the sequence that will minimize tardiness Request Arrival Time (min) Processing Time (min) Due Date A 15 100 200 B 25 150 300 C 30 80 160 D 35 120 250 E 50 30 400 F 68 90 350 5. The next day, Joel was assigned six more jobs (see problem 4). However, for this set of jobs, Joel's supervisor told him to minimize tardiness and the number of tardy jobs. All jobs are equally important. Try the following rules: FCFS, SPT, EDD, CR, and Moore's algorithm. Requests will start being processed after the last one's arrival, that is, 200 minutes. Which sequencing rule will Joel follow? Request Arrival Time (min) Processing Time (min) Due Date U 30 50 300 70 80 380 W 100 90 X 400 110 45 500 150 L 150 480 200 110 560