Which retail-inspired technology did the U.S. Digital Service first implement to dramatically reduce wait times for government services?

The digital transformation of government services has accelerated significantly in recent years, with various strategies employed to improve citizen engagement and service delivery. Many government agencies worldwide have adopted retail-inspired consumer experience strategies to enhance public service access and satisfaction. How well do you understand these modern government service delivery innovations?

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Virtual queuing systems with SMS notifications
Blockchain-based identity verification
AI chatbots for preliminary service triage
Augmented reality navigation for government buildings