Question: Construct a context data flow diagram by using the system operation process provided.

A self-serving kiosk in a videotape rental system can work by providing customers with a user-friendly and automated way to rent and return videos.

1. Rental Process: Customers can browse the selection of available videos on the kiosk's touchscreen interface and select the videos they want to rent. The kiosk can scan the customer's membership card or allow them to create a new account on the spot. The customer can then pay for the rentals using cash, credit card, or debit card.

2. Retrieval: After the customer has made their selection and paid, the kiosk can dispense the videos from its storage unit. The customer can then take the videos and be on their way.

3. Return Process: When the customer is finished with the videos, they can return them to the kiosk. The kiosk can verify the customer's account and check the videos for damage before accepting them. Once the return is accepted, the customer's account is updated to reflect the return, and any late fees or other charges can be applied as necessary.

4. Maintenance: The kiosk needs to be maintained regularly to ensure that it continues to function properly. This can include software updates, hardware maintenance, and periodic cleaning.