Which of these product innovations was specifically developed during WWII as a countermeasure to German U-boats and revolutionized naval warfare with its waterproof packaging?

Throughout military history, product innovation has been crucial to battlefield success. From ancient weapons to modern defense systems, the evolution of military equipment demonstrates how product development shapes warfare outcomes. This poll tests your knowledge about a significant military product innovation that changed the course of warfare and continues to influence modern military strategies and equipment design.

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Hedgehog anti-submarine mortar, featuring multiple spigot bombs in water-resistant casings that only exploded on contact with a submarine's hull
Depth charge Y-gun, with specially sealed explosive chambers designed to withstand water pressure at varying depths
ASDIC sonar system, packaged in rubberized waterproof housing to prevent electrical shorts during extended naval patrols
Magnetic Anomaly Detector, with corrosion-resistant packaging that allowed it to function reliably despite extended exposure to salt water