“The sales system involves the customer, sale, sales items, products, promotion, and accessories. Each
customer can be associated with one or more sales. There are multiple types of sales (e.g., in-store,
online and telephone sales). The customer will use an online shopping cart to store the selected items
for online sales. Each sale is associated with one or more items. With the online sale, the items are
placed in the online cart first and then checked out. A sale transaction is created once the sale is
completed for all types of sales. The Item may have promotions, and the customer can place a comment
on them without any purchases. The inventory tracks all items.”

Design, draw and explain the system sequence diagram (SSD) for the case above. Add any extra details if necessary