Which of these formats can be booked cross-screen (mobile and desktop)?

A) Rich Media Custom Mastheads
B) Video Mastheads
C) Rich Media Layouts Mastheads
D) Video Media Layout Mastheads

The correct answer is:

B) Video Mastheads

Explanation: Google offers a variety of video formats to meet advertisers’ brand needs. These run seamlessly cross-screen:

  • Video Masthead — Including optional interactivity
  • TrueView in-stream ads — Skippable pre-rolls and mid-rolls, including optional interactivity features
  • Reserve in-stream ads — Reservation-booked skippable (In-Stream Select) and non-skippable (standard in-stream) pre- and mid-rolls
  • TrueView Video Discovery ads — Banner template with video thumbnail and text description that drives

Read more here: https://support.google.com/partners/answer/6209157?hl=en