Which military vehicle, first mass-produced in 1916-1917 during WWI, was initially code-named 'Mother' during its secretive development phase?

The 20th century saw revolutionary changes in military technology and strategy. Product development in this sector has often blurred the line between civilian innovation and military application, with many technologies later finding their way into consumer markets. This poll tests your knowledge about a pivotal military product development that changed the course of modern warfare and influenced military doctrine for generations to come.

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• The British Mark I Tank
• The German U-Boat
• The Sopwith Camel Fighter Aircraft
• The American Liberty Truck

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