Video ads can appear on:

  • A) Specific YouTube channels
  • B) All of the listed answers are correct
  • C) Websites on the Display Network
  • D) Specific YouTube videos

The correct answer is:

B) All of the listed answers are correct

Explanation: While video ad content must be hosted on YouTube, video ads can appear on YouTube and on video partner sites and apps across the Display Network, including on tablets and mobile devices (depending on your format and settings).

Read more here: https://support.google.com/partners/answer/2375464