Which retail innovation did the USPS introduce in 2004 that revolutionized customer access to postal services without requiring staff interaction?

The United States Postal Service has a fascinating history of retail innovation as it has adapted to changing times. While it's a government agency, USPS has implemented numerous retail strategies to improve customer experience and maintain relevance in the digital age. This poll tests your knowledge about one of the USPS's significant retail innovations that changed how Americans access postal services.

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Automated Postal Centers (APCs) - self-service kiosks allowing 24/7 access to common postal transactions
Village Post Offices (VPOs) - postal counters embedded within existing retail businesses
Click-N-Ship - the online shipping label printing service
The USPS Mobile App with digital package tracking