What does VAST stand for in the context of video advertising?

VAST stands for Video Ad Serving Template, which is an XML-based framework used to standardize the communication between video players and ad servers. It provides a way for ad servers to deliver video ads to players in a consistent manner, specifying how ads should behave and what assets need to be retrieved.

The VAST template enables publishers and advertisers to serve video ads across different platforms and environments without having to customize their ads for each individual use case. This ensures that video advertising can be delivered efficiently and effectively, optimizing the user experience while providing the necessary tracking and reporting functionality for advertisers.

The other choices reflect terms or concepts that may sound relevant to video advertising but do not represent the standardized framework that VAST provides. Thus, the choice that accurately captures the definition and function of VAST in video advertising is indeed the Video Ad Serving Template.