(A) The third-party ad server returned a malicious ad.
(B) The VAST response from the third-party ad server times out.
(C) The third-party ad server redirected multiple times and reached the redirect limit.
(D) There’s an error with the media asset, and it can’t play.
This question is a part of the Check your Knowledge section of the “Explore Ad Manager’s Video Solutions” lesson from the “Optimize Google Ad Manager to Meet Objectives” course.