Consider the following required functionality of an online DVD shop: Customers should be able to search for DVDS, once they find a product they like, they can add a DVD to their shopping cart. This...

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Extracted text: Consider the following required functionality of an online DVD shop: Customers should be able to search for DVDS, once they find a product they like, they can add a DVD to their shopping cart. This requires that they are logged in; therefore, if they do not yet have an account, they should be able to create one and they can check out the shopping cart. A delivery agent can check the status of online orders, and process an order, meaning that it changes its status from "pending" to “delivered". Finally, the administrator is responsible for the DVD inventory. He/She can check the current inventory, order new DVDS from the supplier, and add DVDS to the inventory. a- Model the use case diagram for the above system. b- Write the use case narrative of the "Check out Shopping Cart" use case