TrueView in-stream ads can appear on:
- A) YouTube Mastheads
- B) the Google Play Store
- C) Google search results and YouTube watch pages
- D) YouTube watch pages
TrueView in-stream video ads can appear on YouTube watch pages and on videos on partner sites and apps in the Display Network.
Read more here: https://support.google.com/adwords/answer/2375464?hl=en