Question Consider the following requirements of a vending machine: A vending machine operates when a customer starts to make a selection. When a button on the machine's panel is pressed, a process executes and either returns a valid selection or, if the customer does not make a selection or there is none of the required product in stock in the machine, returns a message that no product has been selected. If a valid selection has been made, the system look at the product table for the price of the particular product. Then another process executes and collects sufficient coins for the required purchase. When sufficient coins have been entered the process ends and returns an appropriate message If payment is successfully completed the system executes a process to dispense the product and a product table file is updated to show that there is one less of the dispensed product. . Once the product has been dispensed (it is assumed that no error can occur at this point), any change necessary is dispensed using another process a. Draw the UML Use case diagram from the above requirements. [6 pts] b. You need to provide explanations of roles of each actor and functionality of each module the actor is communicating with (4 pts] Artoch File wa Local