Which company first introduced the dry-erase whiteboard marker for mathematics classrooms in 1976, fundamentally changing classroom teaching and creating a billion-dollar industry?

In the world of mathematics education, classroom tools have evolved significantly over the decades. One particular product innovation revolutionized how mathematics is taught in classrooms worldwide, creating an entirely new market category and changing teaching methodologies forever. This poll tests your knowledge about a famous product that transformed math education and created a billion-dollar industry.

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Expo (by Sanford)
Pilot (by Newell Brands)
BIC (by Société BIC)
Crayola (by Hallmark)