Which retail innovation did the USPS introduce in 2004 that revolutionized how customers could handle their postal needs without employee assistance?

The United States Postal Service, despite being a government agency, has engaged in significant retail innovation to stay relevant in the digital age. As one of America's oldest public institutions, USPS has had to adapt its retail presence and offerings while maintaining its core service mandate. This trivia question tests your knowledge about a major USPS retail innovation initiative that changed how Americans interact with postal services.

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Automated Postal Centers (APCs)
Priority Mail Flat Rate Boxes
Click-N-Ship online service
USPS Mobile App