Which product design innovation, first widely deployed during World War I, fundamentally changed modern warfare by combining armor protection, tracked movement, and offensive firepower?

Throughout military history, certain product designs have revolutionized battlefield tactics and strategy. From medieval weaponry to modern combat systems, innovative designs have often determined the outcome of conflicts. This trivia question focuses on a pivotal product design development that significantly altered military doctrine and capabilities. Test your knowledge of how industrial innovation intersects with military history!

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The combat tank (first effectively used by the British at the Battle of Cambrai in 1917)
The aircraft carrier (first converted from merchant ships in 1914)
The submarine periscope system (perfected by Simon Lake in 1902)
The field radio communication system (developed by Marconi and adopted in 1912)