Consider the sequence diagram given below for the use case 'Record a book order and answer the following questions. Record book order System f buyer findBook title or author or ISBN) Find Book Use Case k-- listofMatches (title, author) addToCart (ISBN) confirmation for leach book desired checkout [account exists display Accountino (name, cc. 37 Open new account use case Ino account display Account Setup Ino account) enter Accountinfo (name, billing Address, cc...) newAccountConfirmation 1 1 confirmPurchase C Omaltoseller (purchakeito purchaserinfo) email server Questions (5 marks) 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 diagra a b adie.koi.edu.au Post Atwo - Zoom Punt Allende som OL Student Teachers Administration Web Vebsite Portal Contact List Contact List Print for bach book desired checkout() JP Services Kushal POKHAREL Taccount exists) display Accountino (name, cc...) (no account] display AccountSetup() no account) enter Accountinfo (name, billing Address, CC,..) Open new account use case newAccountConfirmation confirmPurchase mailtoseller (purchaseinfo, purchaserinfo) email server a. Questions (5 marks) How many notes are used in above sequence diagram. List them. b. What is the purpose of vertical dotted lines and horizontal vertical arrows in above diagram? c. Explain the second use case (provided in bottom rectangle in diagram) in your own words based on the messages provided. " B I - %3 * US X2 > l . IS