i want the answer a,b,c pls slove it quick

1. In today's fast-paced life, where ailments are increasing and time to treat them is decreasing, people need fast access to treatment from any part of the world, and the best way to achieve this is through online service. The web-based hospital administration system is designed to serve this purpose. One can look up for specialized medical services, the doctor's availability, and the various treatments provided by the hospital. One can book appointments according to their convenience and select the doctor as per his preference. The doctor's appointment, the ward, the schedule, the initial payment to be done, and other pre-requisites can be handled online for the patient. The existing users can check their previous medical history at any time for future reference. Automatic updating of the bill is done to the user's account throughout the treatment. Online Payment of bills through credit cards is possible. Moreover, the doctors have their account wherein they have access to their personal information and their respective patient information, which can be updated. Each patient, when registered, is provided with username and password through which he is authenticated to view his medical history record and take online help from the doctor. The doctors are also provided with the password-protected account. The accounts are managed by an administrator who has access, controls, and rectifies any problem in the system. a. Define the system requirements clearly and draw the use case. Design the class diagram with relevant associations/cardinality. Draw activity and sequence diagrams for the above use case. C