In AdWords, you can create and manage video campaigns targeting mobile devices by using:

In AdWords, you can create and manage video campaigns targeting mobile devices by using:

  • Masthead video campaigns
  • mobile app engagement campaigns
  • video campaigns
  • mobile app installs campaigns

Correct answer is:

  • video campaigns

Explanation:  Video campaigns let you show video ads on their own or within other streaming video content on YouTube and across the Google Display Network. Option available to target by operating systems, device models, carriers, and wireless networks.
Read more here: https://support.google.com/adwords/answer/6340491