Which retail innovation, first launched in 1896, is widely considered the first structured customer loyalty program in modern retail history?

Throughout history, merchants and retailers have developed various methods to foster customer loyalty. From ancient market traders giving regular customers preferential treatment to today's sophisticated digital loyalty programs, the concept has evolved dramatically. This trivia question explores a pivotal moment in the history of structured retail customer loyalty programs that fundamentally changed how businesses approach customer retention.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

S&H Green Stamps, where customers collected stamps when making purchases that could be redeemed for merchandise
The Great Atlantic & Pacific Tea Company's customer discount cards for repeat shoppers
Montgomery Ward's 'Preferred Customer' medallions that offered exclusive shopping hours
Sears Roebuck's 'Buyer's Club' that offered free shipping on catalog orders