Which of these revolutionary retail innovations was introduced FIRST, fundamentally changing how people shopped?

Test your knowledge about the pioneering retail innovations that shaped our modern shopping experience! Throughout history, visionary entrepreneurs revolutionized how we buy and sell goods. From humble beginnings to global empires, these retail pioneers introduced concepts we now take for granted. Can you identify which historical retail innovation came first and forever changed the landscape of commerce?

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The first self-service grocery store (Piggly Wiggly, allowing customers to select their own items rather than requesting them from clerks)
The first department store credit card (Charga-Plate by Bloomingdale's, enabling customers to purchase on credit)
The first barcode scanner in retail (implemented by Kroger to automate checkout and inventory management)
The first retail loyalty program (S&H Green Stamps, rewarding customers for repeat purchases at participating stores)