Which iconic logo change did Texas Instruments implement for their calculator line in 1992 that signaled their shift toward educational technology?

Texas Instruments has been a cornerstone in mathematics education for decades, with their calculators being essential tools in classrooms worldwide. Their brand has evolved significantly since their founding in 1930, particularly in the calculator product line that revolutionized mathematics education. Test your knowledge about this iconic mathematics brand that bridged technology and education!

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They added the red 'TI' emblem inside a circle, replacing their previous rectangular logo
They introduced the blue pentagon logo with 'TI' in white, abandoning their previous red branding
They switched to a minimalist 'TI' without any shape, focusing on typographic identity only
They adopted the calculator silhouette with integrated 'TI' letters as their primary logo