Draw a Class Diagram for the system described in Case 2 - Etsy Online Store : a) Focus on the classes relevant to product posting (sellers) product search, selection and ordering (customers), and payment (sellers & customers). b) It may help to start by writing a description of the processes that include the above elements in order to draw out the nouns. c) Identify around 15 classes (not including sub-classes) related to the new system that are essential for the functionality of the system in terms of the processes relevant to product posting, product search, selection & ordering, and payment. Put these classes into your Class Diagram. d) You need to mention four to six attributes and at least two operations/methods for each class in the class diagram