Which innovative retail product did the U.S. Postal Service introduce in 2011 that fundamentally changed how government agencies approach consumer product design?

The intersection of government services and retail innovation has led to fascinating product developments in public sector organizations. One notable example is how postal services worldwide have evolved their product offerings to remain relevant in the digital age. This poll tests your knowledge about a significant retail product innovation within the U.S. Postal Service that changed how government agencies approach consumer-facing products and services.

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Forever Stamps that maintain validity despite price increases
Digital Mailbox Service with encrypted communication
Government-issued cryptocurrency for postal transactions
Subscription-based premium mail delivery service