$2.$ Create a data flow diagram $($DFD$)$ to describe an online food ordering system allowing customers to browse restaurant menus, place orders, and make payments. The restaurant staff can manage the incoming orders and update their status. The system also communicates with a payment gateway to process payments.

DFD Components:

$$ Entities: Customer, Restaurant Staff, Payment Gateway.

$$ Processes: Browse Menu, Place Order, Make Payment, Process Order, Update Order Status.

$$ Data Stores: Menu Database, Order Database.

$$ Data Flows: Menu retrieval, order details, payment information, and order status updates.