Which retailer first implemented a sophisticated recommendation algorithm based on purchase history in the 1990s, before Amazon's system became well-known?

Amazon revolutionized retail with its algorithmic recommendation engine, but they weren't the first major retailer to implement personalization at scale. This poll tests your knowledge of retail technology innovation history and which companies pioneered certain customer-centric approaches before they became industry standards. Understanding these milestones helps appreciate how data-driven retail strategies evolved into today's sophisticated personalization ecosystems.

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Netflix (originally as a DVD rental service)
Walmart (with their early database marketing system)
CDNOW (online music retailer with 'Album Advisor')
Barnes & Noble (with their 'Reader's Advantage' program)