Can anoyone help me solve this questions, espeically the part where it requires Order to send a message onto itself. Suppose you are developing an information system for an online book store. Represent the following fragment of a use case description in a sequence diagram. (a) When an order is complete, the ProcessOrder control object gets the total price by sending a getTotal message to the Order object. (b) To calculate the total price, the Order object first gets the price and potential discount of each book by sending the getPrice and getDiscount messages to the Book objects. (c) Then, the Order object gets the cost of shipping by sending getDeliveryPrice to itself. (d) If the order has not been paid yet, the ProcessOrder object arranges the payment by sending the processPayment message to the ProcessPayment. (e) The ProcessPayment object makes 3 attempts at authorising the payment by sending an authorisePayment message to the Bank entity object.