Which food industry innovation was ORIGINALLY responsible for M&M's candy shell that prevents the chocolate from melting?

M&M's have been delighting chocolate lovers since 1941, but there's a fascinating supply chain story behind their iconic candy shell. Before becoming one of the world's most recognized confections, this product innovation solved a critical problem for soldiers. Test your knowledge about this famous candy's development and the strategic decision that revolutionized chocolate consumption worldwide.

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A special sugar coating process developed specifically for the military during WWII
A technique borrowed from traditional French confectionery methods dating back to the 1800s
A chemical preservation method first used in ice cream production
A candy-making process invented by Forrest Mars Sr. during the Great Depression