Which innovative retail product did the USPS introduce in 1992 that revolutionized government retail by allowing customers to purchase postage without visiting a post office?

While we often think of retail innovation as coming from private companies, government agencies have created some of the most impactful retail experiences and services. The United States Postal Service, in particular, has pioneered several retail innovations that transformed how Americans access government services and products. Test your knowledge about one of the USPS's most significant retail innovations that changed the face of American government retail operations.

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Forever Stamps (stamps that remain valid despite future price increases)
Self-service postal kiosks with touchscreen interfaces
Stamps by Phone program (telephone ordering with credit card payment)
PC Postage (software allowing customers to print postage from personal computers)