QUESTION 2 [ cos] 15 Consider the following scenario for a "Hospital Telemedicine System": United Hospital is going to provide remote medical support to the patients. A Visitor can view the doctor profiles, appointment schedules, and general queries about COVID-19 or Monkey pox and responses to them on the website. A Subscriber can book an appointment, purchase medicine, or post a query. Moderators can reply to a query, post announcements, and reschedule an appointment upon request by a subscriber. Doctors can create or update schedules according to their availability. They also write articles on how to stay safe from COVID-19 or Monkey pox infection. When a subscriber books an appointment, he/she visits the FIND A DOCTOR page and searches for doctors in a particular discipline. After selecting a doctor from the DOCTORS LIST page, the subscriber selects a time slot from the available schedule. The subscriber needs to make the payment via bKash, nagad, or debit/credit card at least 6 hours before the time of the appointment. The subscriber can reschedule or cancel any booking with a penalty at least 2 hours before the time of the appointment Management of multiple patients in a single time slot is done by a first-come-first-serve manner. To have the consultation, the subscriber needs to log in at first. After that the subscriber request requests to join the WAITING ROOM. If an appointment is scheduled and the payment is confirmed, the subscriber is allowed to enter into the waiting room. Otherwise, the entry is denied. The doctor allows one single patient from the waiting room into the ONLINE CHAMBER at a time. After having the consultation, the patient downloads a prescription and leaves the online chamber. a) Draw the CRC card and CLASS DIAGRAM for the above scenario. Mention the best practices to identify the classes for any practical scenario. [3+5+2] b) Draw a SEQUENCE DIAGRAM for pre-selection to confirmed appointment state also mention the purposes of different symbols in the diagram. [5]