Which calculator company transformed its brand positioning in the 1980s with its 'Teachers Preferred' marketing campaign that specifically targeted mathematics education?

The calculator industry transformed mathematics education and professional work in the late 20th century. As electronic calculators moved from luxury items to everyday tools, certain brands created innovative marketing campaigns to distinguish themselves in this competitive market. This poll explores how one particular company's branding strategy revolutionized their position in the mathematics education sector through a clever marketing initiative in the 1980s.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Texas Instruments, with their TI series becoming the standard in classrooms
Casio, by introducing the first graphing calculator with color display
Hewlett-Packard, through their RPN calculation system marketing
Sharp, with their solar-powered EL series classroom initiative