Which of the following characteristics describe programmatic advertising?

The correct answer accurately describes programmatic advertising. Programmatic advertising automates the buying and selling of ad inventory using technology platforms (Demand-Side Platforms, Supply-Side Platforms, Ad Exchanges). It leverages data, both proprietary (first-party) and third-party, to target specific audiences and optimize campaign performance in real-time. The other options are incorrect. Programmatic advertising allows for real-time optimization during campaigns, not just after they've ended. While post-campaign analysis is crucial, programmatic's strength lies in its ability to adapt and optimize while ads are running. Furthermore, programmatic advertising simplifies inventory buying across multiple platforms and devices through centralized platforms, rather than forcing advertisers to buy inventory separately for each.