During which conflict was the ironclad warship first successfully deployed in combat, revolutionizing naval warfare product development?

Throughout military history, certain product launches have completely transformed warfare and strategy. These innovations often arrived at critical moments, changing the course of conflicts and sometimes even world history. This trivia question tests your knowledge about one of the most significant product introductions that revolutionized naval combat during a pivotal historical period. Can you identify when this game-changing technology first appeared on the battlefield?

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American Civil War (USS Monitor vs. CSS Virginia, 1862)
Crimean War (1853-1856)
Franco-Prussian War (1870-1871)
Russo-Japanese War (1904-1905)