Some initial requirements for an online document management system have been captured below: "The system must be available 24/7. Anybody will be able to browse the catalogue but will need to provide their membership details (user names and passwords) if they wish to download or upload documents. User names will usually be email addresses and passwords will be eight characters long. If the details do not match any existing members they will be given the opportunity to register. Users should also be able to register even when they do not want to download or upload. It should be possible for the admin team to cancel membership but members should not be able to do this themselves. The interface must comply with Disability Access legislation. A weekly report of all registered members must be produced." Identify the functionality required and draw a use case diagram to show this and the primary actors who will trigger each use case. 1) Identify two functional requirements and two non-functional requirements. 2) Build the use case diagram. 3) Propose sequence diagrams. 4) Ahmed suggested to use the layered architecture to build the system. Do you agree with him. Justify your answer.