Which mathematical product innovation first allowed for widespread dynamic visualization of functions and geometric concepts in classrooms during the 1980s-90s?

The field of mathematics education has seen significant product development innovations over the decades. Tools that help visualize abstract concepts have revolutionized how students learn and engage with mathematical principles. This poll tests your knowledge about a pivotal moment in the evolution of mathematical learning products that changed classroom dynamics worldwide.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Graphing calculators (e.g., TI-82, TI-83)
Digital slide rules
Early computer algebra systems (CAS)
Overhead projector transparencies with grid systems