Below is the answer and explanation for the question The standard companion banner size for TrueView in-stream ads on YouTube is: 

The standard companion banner size for TrueView in-stream ads on YouTube is:

• A) 300×80
• B) 300×600
• C) 300×60 ✅
• D) 300×250

correct answer

300×60 ✅

explanation

Companion banners are optional image banner ads that appear on the top right corner of the watch page for the duration of the content video. When an in-stream video ad ends (or is skipped) the companion banner remains on the YouTube page and the user can click on it at any time. If you choose to include companion banners, be aware that that they’ll display only in the context of a desktop watch page on YouTube. They do not appear on mobile devices, embedded players, connected TVs, or on game consoles.

In some cases, if a custom companion creative (300×60) is not supplied and the ad is a public YouTube hosted video, a video wall companion will be automatically generated which includes information about the channel hosting the video ad.

Read more here: https://support.google.com/displayspecs/answer/6244557?hl=en[1234]

The above answer and explanation are related to Google ads video certification. You can find all the updated questions and answers related to Google video ads certification exam on the “Google ads video assessment answers” page. If you find any error or update in questions or answers, do comment below and let us know. We will update the answers as soon as possible.