Which early retail innovation from the 1950s is considered the first widespread implementation of personalized marketing that directly influenced today's retail personalization algorithms?

Before algorithms and big data, retail personalization had its roots in innovative historical practices. This trivia explores a pivotal moment in retail history when personalization strategies first emerged at scale, changing how stores connected with customers. Test your knowledge of how today's sophisticated retail personalization techniques evolved from humble beginnings!

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S&H Green Stamps loyalty program, which tracked purchase patterns and offered personalized rewards based on shopping behavior
Montgomery Ward's handwritten customer cards that stored individual preferences and purchase history for future recommendations
Sears Roebuck's regional catalog variants that adjusted product offerings based on geographic purchasing trends
A&P's 'Preferred Customer' checkout lanes that provided personalized service based on previous shopping volume