Which company first introduced a commercially successful graphing calculator that became widely adopted in mathematics education during the early 1990s?

The introduction of advanced graphing calculators transformed mathematics education and created an entirely new product category. These devices bridged the gap between abstract mathematical concepts and visual representation, revolutionizing how students learn and apply mathematical principles. This poll tests your knowledge about the history and development of these influential educational tools that have become essential in mathematics classrooms worldwide.

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