Which calculator brand was first to introduce the graphing calculator to the consumer market, revolutionizing high school and college mathematics education in the 1980s?

The world of mathematics has been transformed by various tools and technologies throughout history. Perhaps none has had a more profound impact on everyday calculation than the electronic calculator. This poll tests your knowledge about the history of calculator brands and their impact on mathematics education and consumer habits. How well do you know the revolutionary products that changed how we crunch numbers?

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Texas Instruments (with the TI-81)
Hewlett-Packard (with the HP-28C)
Casio (with the fx-7000G)
Sharp (with the EL-5200)