Which calculator brand first pioneered the 'Try Before You Buy' program that allowed schools to use their graphing calculators for a full semester before purchasing?

In the world of mathematical education products, innovative marketing strategies have helped certain brands stand out in a competitive market. Test your knowledge about how mathematical product companies have used creative approaches to reach their audience and build brand recognition. This question focuses on a notable marketing campaign that revolutionized how mathematical tools are promoted to students and educators.

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Texas Instruments with their TI-Navigator program
Casio with their ClassPad Initiative
HP with their Classroom Calculator Project
Sharp with their EduCalc Outreach