Let's practice identifying use cases by working with an existing system with which you are probably already familiar: an e-mail application. Let's define the system as just the e-mail client, meaning the program or website that you work with directly when you use e-mail.Let's apply the user goal technique to identify use cases for an e-mail client application. When you sit down and open your e-mail program or go to the website for your e-mail service, what are some goals that you might be trying to accomplish?