Which of these military products was specifically designed to break the stalemate of trench warfare during World War I and represented a revolutionary approach to battlefield mobility?

Throughout military history, certain weapons and equipment designs have revolutionized warfare and become iconic. These products weren't just tools of war but masterpieces of engineering that represented significant advances in technology, tactics, and military thinking. This trivia challenges you to identify a groundbreaking military innovation that fundamentally changed battlefield dynamics and represented a revolutionary product design in its era.

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The British Mark I tank, first deployed at the Battle of the Somme in 1916
The Maxim machine gun, which was actually developed in the 1880s before trench warfare emerged
The Sopwith Camel aircraft, which was primarily designed for air combat rather than ground support
The Lee-Enfield rifle, which was a standard infantry weapon but not designed specifically to counter trench warfare