This lab enhances the trivia quiz from the previous lab as described next.

Following the description are UML class and sequence diagrams to guide you if you need more help.

This section gives UML diagrams showing how your classes relate and how their objects interact:

• Class Diagram
• Sequence Diagram 1: Successful login
• Sequence Diagram 2: Successful new registration

For full credit, your application must:

• Correctly track multiple logins and registrations
• Give error messages when input is missing, and
• Correctly store statistics for multiple users