Which innovative product development approach did the British use when creating the first military tank (Mark I) in 1916?

The development of military technology has often been accelerated through innovative product development strategies. The tank, in particular, represents one of history's most significant military product innovations. This trivia question focuses on how a revolutionary approach to product design and testing transformed armored warfare during World War I. Test your knowledge about this pivotal moment in military product development!

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They used the "codename strategy" - developing it under the secret project name "tank" (water tank) to conceal its true purpose from enemy intelligence
They employed "reverse engineering" - capturing and improving upon German armored vehicle prototypes found on the battlefield
They utilized "crowd innovation" - holding a public design competition where citizens submitted ideas for breaking the trench warfare stalemate
They implemented "field testing validation" - building full prototypes and testing them in actual combat before finalizing the design specifications