Which of these famous product innovations was originally developed as a military contract item during WWII and later became a household consumer product?

Throughout military history, certain products have revolutionized warfare and changed the course of conflicts. Some innovations were specifically designed for combat, while others were initially developed for civilian use before finding critical military applications. This poll tests your knowledge about a famous product innovation that significantly impacted military operations during a pivotal historical conflict.

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Duct tape (originally called 'Duck Tape'), created to seal ammunition cases waterproof
Super Glue (cyanoacrylate adhesive), developed to make clear plastic gun sights
WD-40 lubricant, created to protect the Atlas missile from rust and corrosion
Post-it Notes, designed for covert battlefield message transmission