Which product innovation revolutionized the chocolate industry by making milk chocolate production commercially viable on a large scale?

The chocolate industry has seen remarkable product innovations over the decades, transforming how our favorite treats are made and consumed. Many groundbreaking techniques have revolutionized chocolate production, but do you know which innovation truly changed the game? Test your knowledge of food manufacturing history with this chocolate innovation trivia!

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Conching (the process invented by Rodolphe Lindt that creates smoother chocolate texture)
The development of the tempering machine (controlling chocolate crystallization)
Condensed milk powder process (invented by Henri Nestlé in 1867)
Alkalization (Dutch process developed by Coenraad van Houten to reduce bitterness)