$5.$ Consider the following simple scenario and answer the questions that follow $(40$ marks$)$;

BlueSeas group, a leading retail chain store, plans to extend special discounts and offers to their premium customers. The existing customer information database needs to be modified to group the customers based on their unique buying behavior

i$.$ Identity the actors in the system

ii$.$ Identify the use cases for the cashier and draw the use case diagram

iii. Draw the class diagram, using appropriate relationships. Define the relationships used.