For the diagram shown below, answer the following questions: In your words, explain the functionality of the system (1 points) Draw the equivalent sequence diagram (2 points) a) b) Note: numbers are not nested hierarchically, however they are ordered sequentially. 1:placeOrder SER Customer Record 2: *find 3. linvalid customer] rejectOrder s: Salesperson 5: [no stock] apologyMessage 4: findStock 8: placgQuery 6: update st Stock 7:confirmOrder m: Manager Query