Which mathematical retail innovation did Texas Instruments introduce in 2004 that became standard in classrooms worldwide, replacing its predecessor while maintaining backwards compatibility?

The graphing calculator market represents one of the most enduring examples of product stability in educational technology. While smartphones and tablets have disrupted many markets, specialized mathematical tools maintain significant classroom presence. This poll explores the retail history behind one of the most recognizable mathematical tools that revolutionized how students interact with mathematical concepts.

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The TI-84 Plus graphing calculator, which revolutionized the market with flash memory and USB connectivity while maintaining compatibility with TI-83 Plus programs
The TI-Navigator system, a wireless classroom learning system that allowed teachers to collect student graphing calculator data in real-time
The TI-Nspire series, which introduced a computer algebra system and dynamic geometry tools to replace traditional graphing calculators
The TI-SmartView emulator software, which allowed teachers to project calculator displays on classroom screens for the first time