a) What do you understand by a data flow diagram? [2 marks] [4 marks] b) Briefly explain the major purpose of the data flow diagram c) Consider the following narratives: The XYZ club has receptionists who register the members, receive membership fees update member records and can also delete member records. The system Admin, manages user accounts because on registration, a user is supposed to have access to the cluresources which are available over the club's Intranet. The management can view list of members checks payments details and can send mails to all users using their individual e-mails which they provide during registration. i. Draw a level 0 DFD for this narrative. (6 marks] ii. Give at least two use cases associated with the actor "receptionis!" 12marks] iv. Pick one of the use cases in 4 d(ii) above and right a basic flow of events for that use (4marks] case. For the use case selected in 4 d (ai), the basic flow of events may no. go as planned. Write down at least two of the potential factors that may generate an alternative flow of events. 12marks]