Which military product design innovation was specifically developed during WWII to reduce the visibility of naval vessels to enemy radar?

Throughout history, military product development has been a critical factor in determining battlefield success. From ancient weapons to modern defense systems, the evolution of military equipment reflects changing strategies, technologies, and combat requirements. This trivia question focuses on a fascinating case of military product design that changed the course of warfare. Test your knowledge of how military equipment has evolved to meet battlefield challenges!

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Dazzle camouflage - geometric patterns painted on ships
Radar-absorbent paint containing ferrite particles
Submarine snorkels allowing underwater diesel operation
Sonar-deflecting hull shapes based on fish anatomy