You were asked to create an activity diagram with use case descriptions for their online registration system. The staff of each academic department should be able to examine the courses offered by their department, add and remove courses, and change the information about them (for example, the maximum number of students permitted) using the system. It should permit students to examine currently available courses, add and drop courses to and from their schedules, and examine the courses for which they are enrolled. Department staff should be able to print a variety of reports about the courses and the students enrolled in them. The system should ensure that no student takes too many courses and that students who have any unpaid fees are not permitted to register.