Which option best describes the process of applying a discount using a rewards card?

Scanning the rewards card is integral to the process because it identifies that the customer is part of the rewards program. When the card is scanned, the system automatically applies any available discounts associated with that card, ensuring that the customer receives the benefits they are entitled to without needing to take additional steps. This system streamlines the checkout process, making it easier and faster for both the barista and the customer, as customers do not need to remember or manually enter discount codes.

The other methods mentioned—such as entering manual discount codes, automatically applying discounts based on total spending, or requiring customers to ask for discounts—are less efficient and could lead to missed opportunities for applying rewards. Each of these other options introduces a degree of complexity or reliance on customer input that isn't necessary when scanning a rewards card.