Which digital advertising innovation was first widely adopted by government agencies to target specific demographic groups during public health campaigns?

In the world of politics and government, communication strategies and advertising techniques are crucial for public engagement and policy awareness. Government agencies often employ innovative approaches to reach citizens and convey important messages. This trivia question focuses on a groundbreaking digital advertising innovation that transformed how government campaigns connect with the public.

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Programmatic advertising with behavioral targeting
QR code integration in traditional media
Augmented reality (AR) public service announcements
Blockchain-verified message authentication