• Bumpers
• Mobile app
• TrueView
• Display

The correct answer is: Display

Explanation: Once third-party media quality verification has been enabled, you can start buying inventory from sites where Display & Video 360 has IAS classification data. During your campaigns, Display & Video 360 will determine each impression’s level of brand safety by using the impression’s URL to look up brand safety information from IAS.

Read more here: https://support.google.com/displayvideo/answer/3297897