Which statement is true about the efficiency of the auction within "100 milliseconds"?

The statement about the efficiency of the auction within "100 milliseconds" being true highlights the capability of handling a vast number of impressions in a very short timeframe. In programmatic advertising, particularly with real-time bidding (RTB), the entire auction process is designed to occur almost instantaneously. Millions of impressions can be processed simultaneously, allowing advertisers to reach their audience effectively and efficiently during each auction event.

This rapid processing capability is essential because it enables marketers to take advantage of fleeting opportunities to bid on ad placements as users navigate the web. The need for speed is a core aspect of programmatic advertising, ensuring that bids can be placed and accepted before the user completes their engagement with a web page.

In contrast, other statements do not accurately reflect the nature of programmatic auctions: limiting the process to a few impressions would undermine the scalability and effectiveness of programmatic systems, focusing on a single bid would negate the competitive nature of auctions, and manual verification of impressions would significantly slow down the process, making it impractical for real-time environments. Thus, the ability to process millions of impressions within such a narrow window is what defines the efficiency of programmatic auctions.