University has decided to set up a new coffee management system. These are the informal) requirements: A coffee machine dispenses coffee at the press of a button. There are different coffee flavors (espresso, cappuccino, or latte macchiato) with different prices. Every user has an account on the coffee management system. Every user logs on to the system using some identification (a password or picture). Users choose the coffees they will have and mark them as dispensed". The price for the coffee is automatically deducted from their account. A special user (the "administrator") can recharge user's accounts. Draw any of the two diagrams for the given case study: a) Use case Diagram P. 1/1 b) Activity Diagram c) Sequence Diagram