Which calculator company was the first to successfully market their products directly to schools, creating the educational calculator market segment in the 1980s?

The calculator market has transformed mathematics education and professional work for decades. From basic arithmetic to advanced scientific and graphing functions, calculator brands have competed to innovate and capture market share in educational institutions and professional settings. This poll tests your knowledge about a significant development in calculator retail history that changed how these mathematical tools were marketed and sold.

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