Which of the following retail operation changes did the USPS implement in the 1990s as part of its modernization efforts?

The United States Postal Service (USPS) is one of the nation's oldest government retail operations, serving citizens across all 50 states. While primarily known for mail delivery, it also operates one of the largest retail networks in America. This trivia question explores how this government agency has evolved its customer experience and brand identity over the decades, adapting to changing public needs while maintaining its constitutional mandate.

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Introduced self-service kiosks that allowed customers to conduct postal transactions without employee assistance
Eliminated all physical retail locations in favor of a completely digital mail ordering system
Privatized all retail operations by licensing independent contractors to run postal counters
Launched a subscription-based premium service that guaranteed same-day delivery for enrolled members