Which product development innovation is credited with revolutionizing mathematics education in the 1970s, making abstract concepts more accessible to students worldwide?

In the world of mathematics educational products, innovation in product development has been crucial to helping students grasp complex concepts. Over the decades, certain revolutionary tools have transformed how mathematics is taught and learned. This poll tests your knowledge about a pivotal moment in mathematical product history that changed classroom dynamics forever. Do you know which breakthrough product development strategy led to one of the most significant shifts in mathematics education?

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The introduction of graphing calculators with Computer Algebra Systems (CAS)
The development of standardized math workbooks with progressive difficulty levels
The creation of math-focused educational television programs with animated examples
The implementation of manipulative blocks designed for teaching algebraic concepts