In Chapter 3 and Chapter 5, you identified and then modeled use cases for the Multiple Listing Service (MLS) application. You also identified and modeled domain classes. Use your solutions from these chapters to do the following:

1. Draw a first-cut design class diagram based on the domain classes for the Create new listing use case. 

2. Use the CRC cards technique to identify the classes that are involved in the Create new listing use case. Recall that creating a new listing involves an agent, a real estate office, and a listing. Decide which class should have the primary responsibility for collaborating with the other classes and then complete the CRC cards for the use case.

3. Update the design class diagram with method names from the CRC cards. For this solution,

do not try to determine entire method signatures, just the names.