Community Board of Realtors The Multiple Listing Service system has a number of use cases, which you identified in Chapter 3, and three key domain classes, which you identified in Chapter 4: RealEstateOffice, Agent, and Listing. 1. For the use case Add agent to real estate office, write a fully developed use case description. Also develop an activity diagram and draw an SSD. Review the case materials in previous chapters and recall that the system will need to know which real estate office the agent works for before prompting for agent information. 2. For the use case Create new listing, write a fully developed use case description. Also develop an activity diagram and draw an SSD. Recall that the system needs to know which agent made the listing before the system prompts for listing information. 3. Do a CRUD analysis based on the use cases and classes you have identified. What does it show? Community Board of Realtors The Multiple Listing Service system has a number of use cases, which you identified in Chapter 3, and three key domain classes, which you identified in Chapter 4: RealEstateOffice, Agent, and Listing. 1. For the use case Add agent to real estate office, write a fully developed use case description. Also develop an activity diagram and draw an SSD. Review the case materials in previous chapters and recall that the system will need to know which real estate office the agent works for before prompting for agent information. 2. For the use case Create new listing, write a fully developed use case description. Also develop an activity diagram and draw an SSD. Recall that the system needs to know which agent made the listing before the system prompts for listing information. 3. Do a CRUD analysis based on the use cases and classes you have identified. What does it show