URGENT PLEASE ANSWER IN 25 MINS

Consider the sequence diagram given below for the use case 'Record a book order' and answer the following questions. Record book order System | 1 buyer 1 1 1 L. 1 1 findBook (title or author or ISBN) Find Book Use Case listOfMatches (title, author, ...) addToCart (ISBN) confirmation for beach book desired 1 checkout (account exists) display Accountinfo (name, CC, ...) Open new account use case 1 (no account) displayAccount Setup ( (no account) enter Accountinfo (name, billingAddress, cc...) ----------- newAccountConfirmation 7 1 confirmPurchase() 1 -3D- EmailToSeller (purchaseinfo, purchaserinfo) 1 email server Questions (5 marks) a. b. How many notes are used in above sequence diagram. List them. What is the purpose of vertical dotted lines and horizontal vertical arrows in above diagram? Explain the second use case (provided in bottom rectangle in diagram) in your own words based on the messages provided. C