Which retail technology innovation first enabled customers to test complex mathematical visualization software remotely before purchasing?

In the world of mathematics education and product sales, technology has transformed how mathematical tools and educational products are marketed and sold. From advanced calculators to geometry software, companies employ various techniques to distinguish their products in this specialized market. This poll tests your knowledge about a significant retail technology advancement that revolutionized the marketing of mathematical tools.

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Interactive online demo platforms with cloud computing (2007)
CD-ROM trial versions with mail-in registration (1995)
Mobile app preview functionality with in-app purchases (2010)
Virtual reality mathematics simulation environments (2015)