Which calculator company pioneered the 'educational endorsement' retail strategy in the 1970s that led to their products becoming the standard in mathematics classrooms worldwide?

In the 1970s and 1980s, one mathematical tool transformed from an expensive professional instrument to an everyday classroom essential. This revolution wasn't just about technological advancement, but also about brilliant retail marketing strategies that changed how mathematics was taught worldwide. Test your knowledge about this pivotal moment in mathematics education retail history that democratized calculation tools for students everywhere.

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Texas Instruments, with their strategic pricing and educator approval program for the TI series
Casio, with their 'Scientific Calculator for Every Student' campaign and school donation program
Hewlett-Packard, through their university partnership program that standardized the HP-35 in higher education
Sharp, with their 'Mathematics Made Clear' initiative that included teacher training and curriculum integration