What describes a system where goods are replaced as they are used via a card method?

The correct choice describes a system often employed in inventory management, where goods are replenished as they are consumed. This method optimizes the flow of materials by ensuring that stock levels are maintained without excess or shortages, which is crucial for effective supply chain operations.

In the context of Supplier Managed Inventory, the supplier takes responsibility for managing the inventory levels at the customer's location. They monitor usage through data provided, which may be aggregated from card transactions, and adjust stock levels accordingly. This system creates a seamless link between usage and replenishment, as the supplier can react to changes in demand directly with timely restocking.

Other options, such as the Kaban method, also relate to inventory management but focus more specifically on visual signaling systems to maintain flow and work in progress rather than direct management by the supplier. Purchasing Cards refer to a method of procurement and payment for goods and services, while Material Requirements Planning involves scheduling and managing manufacturing processes based on demand forecasts rather than real-time usage data. Therefore, Supplier Managed Inventory is the most accurate description of a system where goods are replaced as they are used via a card method.