If someone clicks a TrueView video discovery ad, where do they land?

A) The ad’s destination URL
B) The advertiser’s YouTube masthead
C) The video on the YouTube watch page or advertiser’s channel
D) The advertiser’s website

The correct answer is:

C) The video on the YouTube watch page or advertiser’s channel

Explanation: Clicking the ad will deliver a user to the YouTube watch or channel page to view the video rather than playing the video within the ad unit itself.

Read more here: https://support.google.com/displayspecs/answer/6227733?hl=en