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

  1. Customer reads menu
  2. Customer places order
  3. Order is sent to kitchen for preparation
  4. Ordered items are served
  5. Customer requests for a bill for the order
  6. Bill is prepared for this order
  7. Customer is given the bill
  8. 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. $3$
  2. $4$
  3. $5$
  4. $6$
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Option (3) 5

1. Customer

2. Order taking person

3. Cook

4. Serving person

5. Bill generator

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