In a system for a restaurant, the main scenario for placing an order is given below :

(a) Customer reads menu

(b) Customer places order

(c) Order is sent to the kitchen for preparation

(d) Ordered items are served

(e) Customer requests for a bill for the order (f) Bill is prepared for this order (g) Customer is given the bill (h) Customer pays the bill A sequence diagram for the scenario will have at least how many objects among whom the messages will be exchanged.

1. A3
2. B4
3. C5
4. D6

Pick an option to check yourself, or open the answer below.

Show answer & explanation

Correct answer: C. 5

Explanation

The scenario involves at least five participants exchanging messages — customer, waiter, kitchen, the order/bill, and the cashier — per the official key.