A sample customer receipt from a superstore ABC is shown in the following. (a) Based on the receipt, devise a class diagram with their associations. Specify clearly the multiplicity of every association. (b) List out the possible UML classes with all attributes. Markup all the primary key attributes with < > and any object attributes. No methods are required. (c) List out all the calculated attributes, if any. Specify all your assumptions. ABC LEVEL 1 OF MEGABOX, KOWLOON BAY, HONG KONG TEL: 2339 3388 SALES RECEIPT Operator ID: 9800657 Trx Time: 18:30:00 Date: 19 March 2022 1. 003946738 1@ 69.90 69.90 Target Apple Pie Discount 10% -7.00 2. 004738222 2@ 19.90 39.80 Jacob's Hi-Cal Biscuit Discount 10% -4.00 3. 006001666 1@ 0.00 0.00 Environmental Levy VIP Card No.: 12345678 Membership Expiry Date: 31 July 2023 Bonus Point(s) Accumulated: 23 Total: 98.70 Cash: 100.00 Change: 1.30