Question 4: (20 Marks) 4.1 10 Marks You are required to draw a sequence diagram and a corresponding communication diagram for the below given scenario based on Question-1. Given below is a scenario in which a font-office staff schedules and completes an appointment for a visitor meeting. The front-office staff validates the visitor details, The staff notifies the department about the appointment. The staff checks the types of appointments; individual or organization with the visitor. Then the staff confirms the details to the concerned department and receives confirmation to proceed. The staff updates the schedule. The staff updates the meeting with required details and then receives confirmation. The staff updates the appointment details. The staff sends confirmation message to the visitor about the meeting. 4.2 7 Marks You are required to draw a state chart diagram for the below given scenario based on Question-1. Assume a scenario of visiting schedule's various states according to the below given description. The visiting schedule is empty at the initial stage. A schedule becomes updated when visitors added to the schedule and becomes full when the number of visitor limit for a day is reached. During the update, the schedule will be checked for the number of empty slots. In addition to this, during the update process for any system error, the schedule will not be processed and updated. You should use a simple counter to keep track of the available slots and another counter for the visitor limit. 4.3 What does a final state signify in your diagram? 1 Mark 4.4 What is a self-transition? Provide one example from your diagram. 1 Mark 4.5 What is a Guard? Provide one example from your diagram. 1 Mark