TrueView Video Discovery ads run on:

  • A) The Search Network and the Display Network
  • B) The YouTube Network
  • C) The Display Network
  • D) YouTube video and search pages and the Display Network, home page, channel, watch page

The correct answer is:

D) YouTube video and search pages and the Display Network

Explanation: TrueView Video Discovery ads appear on YouTube-related videos search results pages; the video opens on a YouTube watch or channel page, Video partner sites and apps on the GDN

Read more here: https://support.google.com/adwordspolicy/answer/2679940?hl=en