- QA Helper extension
- Google Web Designer
- IAB VAST tag tool
- Creative Preview app
The correct answer is: Creative Preview app
Explanation: Creative Preview is an Android and iOS mobile app for previewing mobile creatives. Use Creative Preview to test ads on mobile phones and tablets using supported mobile ads SDKs.
Creative Preview works with DoubleClick Studio, Campaign Manager (DCM), Bid Manager, and Ad Exchange. Some preview features (such as the in-app console) are currently only available in certain products. Any limitations are noted below.
Read more here:https://support.google.com/richmedia/answer/2879163