Which calculator design innovation, introduced by Texas Instruments in 1990, revolutionized mathematics education by making graphing technology more accessible to students?

The mathematics education market has evolved dramatically over the decades, with various tools and technologies reshaping how students learn and engage with mathematical concepts. Beyond traditional textbooks and chalkboards, innovative companies have created products that have revolutionized mathematics education. This poll tests your knowledge of a pivotal product design change that transformed the calculator market and influenced consumer behavior in mathematics education.

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The TI-81 with its flip-cover design
The TI-83 with its QWERTY keyboard layout
The TI-92 with its touchscreen interface
The TI-85 with its solar-powered capability