Which World War II military supply chain innovation, known as the 'Red Ball Express,' was crucial for Allied success after D-Day?

The logistics of warfare have always been critical to military success. Throughout history, innovations in military supply chains have often determined the outcome of conflicts. From ancient armies carrying their provisions to modern just-in-time logistics systems that support global military operations, the evolution of military supply chains represents one of the most significant aspects of military history. Test your knowledge about a revolutionary supply chain innovation that changed the course of warfare.

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A continuous truck convoy system that transported over 400,000 tons of supplies to advancing Allied forces
An aerial supply drop system using specialized red parachutes visible from the ground
A submarine-based resupply network that delivered ammunition under the English Channel
A rail-based delivery system using bright red high-speed trains for priority military cargo