You are the IT director at Big Ten University. As part of a training program, you decide to draw a DFD that includes some obvious mistakes to see whether your newly hired junior analysts can find them. You came up with the diagram 0 DFD shown in Figure 5-19. Based on the rules explained in this chapter, how many problems should the analysts find STUDENT ID NUMBER TENTATIVE SCHEDULE ASSIGN ADVISOR MEET WITH ADVISOR CHECK OPEN CLASSES FINAL CLASS SCHEDULE D5 CLASS ROSTER CLASS ROSTER INSTRUCTOR STUDENTS ATTENDING D6 SEATING CHART SCHEDULE OF OFFICE HOURS STUDENT ID NUMBER FINAL GRADE CALCULATE GRADE STUDENT D4 GRADES