Which mathematical learning tool was originally developed as a product for blind students before becoming mainstream in mathematics classrooms worldwide?

In the world of mathematics education and learning tools, innovative products have transformed how we teach and understand complex concepts. This poll tests your knowledge about a significant milestone in the development of mathematical learning tools that revolutionized classroom technology. Can you identify the correct product development fact among these options?

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The graphing calculator, which was designed to help visually impaired students visualize mathematical functions through tactile feedback
The Abacus, which was redesigned in the 1950s with raised beads and frames for blind students before being adopted in standard classrooms
The Cuisenaire rods, which were created with distinctive textures before color-coding became their primary feature
The Geometric Sketchpad software, which began as an audio-descriptive geometric modeling tool before evolving into visual interactive software