Which of these military products, when first introduced to warfare, was marketed to European rulers with the slogan 'The ultimate equalizer on the battlefield' in the 15th century?

Throughout military history, certain products and innovations have fundamentally changed how wars are fought. From ancient times to modern conflicts, technological breakthroughs have often determined victory or defeat. This poll tests your knowledge about one such revolutionary product launch that had profound effects on military strategy, tactics, and ultimately the course of history. Do you know which military innovation transformed warfare in this specific era?

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The matchlock handgun, which allowed infantry to defeat heavily armored knights
The steel crossbow, which could be manufactured in large quantities for common soldiers
Plate armor suits, which provided comprehensive protection for elite warriors
Greek fire projectors, which could devastate wooden fortifications from a distance