Which 'failed' adhesive experiment at 3M eventually led to the creation of Post-it Notes after a marketing breakthrough?

In the world of accidental inventions that transformed everyday life, some products have fascinating origin stories. The journey from laboratory mishap to market phenomenon often involves brilliant marketing strategies that turned potential failures into household names. This poll tests your knowledge about one such famous product that revolutionized office organization and personal reminders through innovative brand strategy and market positioning.

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Spencer Silver's 'low-tack' adhesive that was initially rejected for being too weak for industrial applications
Arthur Fry's non-drying glue formula intended for automobile manufacturing that was deemed too temporary
William McKnight's transparent tape prototype that couldn't maintain stickiness on vertical surfaces
Ruth Benerito's wrinkle-free fabric treatment accidentally applied to paper that created removable bookmarks