Which packaging innovation was specifically created for the original WWII K-Ration to protect its contents from harsh battlefield conditions?

During World War II, packaging innovations revolutionized how soldiers were fed in combat. The K-Ration, developed in 1941, was a compact individual daily combat food ration introduced by the United States Army. Designed by Dr. Ancel Keys, these rations came in specialized packaging that helped preserve food in various combat conditions while being lightweight enough for soldiers to carry. This poll tests your knowledge about this significant development in military food packaging history.

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Waxed cardboard boxes sealed with waterproof glue
Tin cans with pull-tab openings
Vacuum-sealed glass containers
Aluminum foil pouches with heat-sealed edges