Draw a sequence diagram to represent the scenario of “using vending machine to purchase drinks”. Four objects have been defined as follows. Add the following functions: (1) change when the customer...

Draw a sequence diagram to represent the scenario of “using vending machine to purchase drinks”. Four objects have been defined as follows. Add the following functions: (1) change when the customer pays more than the price of the purchased beverage; (2) return the customer's payment if the purchased beverage has been sold out, otherwise, it will be sold normally. Draw a complete sequence diagram showing the above functions.