$4.$ For the use case Add new resort, write a fully developed use case description, and draw a System Sequence Diagram $($SSD$).$ Review the classes that are associated with a resort in the domain model above to understand the flow of activities and repetition involved.

$5.$ Draw an activity diagram to show the flow of activities for the use case Add a new resort.

Note: This activity diagram is based on the updated problem domain model.