Which revolutionary product design innovation during World War I fundamentally changed tank warfare by allowing tanks to cross difficult terrain more effectively?

Throughout history, military equipment design has evolved dramatically based on tactical needs, available materials, and technological advancements. From ancient armor to modern combat systems, product design in military contexts has always balanced protection, mobility, and lethality. This trivia question focuses on a revolutionary product design change that transformed warfare in the early 20th century. Test your knowledge of how innovative product design shaped military history!

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The rhomboid hull design with tracks that wrapped around the entire vehicle
The rotating turret with 360-degree firing capability
The Christie suspension system with road wheels
The sloped armor plating that deflected projectiles