Design the Use Case Diagram And Sequence diagram.

Functional Requirements: Chatting application System comprises of following functional modules: 1. Admin: Administrator will be able to create an account. Administrator will be able to login. . Administrator will be able to create different chat groups according to different disciplines or general such as Data base group, Networking group, Embedded system group, Assignment group, Machine learning group, Artificial Intelligence (AI) group, and Fun group etc. Administrator will be able to approve requests to enter a group. Administrator will be able to reject requests to enter a group. Administrator will be able delete a person from a chat group. Administrator will be able to devise rules and regulations for each chat group. If a user does not follow the rules and regulations of a certain group then administrator will be able to mute that specific user. 2. User: User will be able to sign up to the application. User will be able to join a group of his/her own choice. Upon entering a chat group, general terms and conditions will be provided to user. User will be able to post a message. User will be able to share a file. User will be able to use web cam in private chat. User will be able to start a private chat with another participant. User will be able to leave a group