During World War II, which revolutionary supply chain innovation allowed Allied forces to rapidly establish temporary harbors on the beaches of Normandy after D-Day?

Throughout military history, supply chain logistics have often determined the outcome of conflicts as much as tactics and weaponry. From Alexander the Great's revolutionary logistics system to modern just-in-time delivery of military supplies, the evolution of military supply chains represents a fascinating aspect of warfare that often goes unnoticed. This poll tests your knowledge about a critical supply chain innovation that changed the course of a major conflict.

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Mulberry Harbors - floating prefabricated ports towed across the English Channel
Red Ball Express - a truck convoy system that delivered supplies directly to combat zones
Liberty Ships - mass-produced cargo vessels that could be assembled in under 50 days
PLUTO (Pipe Lines Under The Ocean) - underwater fuel pipelines connecting Britain to France