Problem Description: To complete this assignment, you should refer to the attached case study that shows simple use case activities involved for a use case named "Buy Goods". You should refer to this case study template and write similar activity steps for the following scenarios: 1. Create a list of steps for "Handling returned goods" use case Make sure that your assignment has the following included in your submission 1. Main success scenario 2. Extensions 3. Sub variations 4. Related Information 5. Open issues 6. Schedule