- A Floodlight tag with the activities set to collect in-app variables, available in DT files
- A dynamic publisher pixel implemented in the Floodlight tag
- An HTML5 macro added to the Floodlight tag and ad tag, and uploaded in the SDK
- A user-resettable device identifier passed to both Floodlight tags and the ad tags running in apps
The correct answer is: A user-resettable device identifier passed to both Floodlight tags and the ad tags running in apps
Explanation: Before you can attribute app installs or activities back to ad impressions and clicks in apps, the partners need to work together to ensure that user-resettable device identifiers and other values are passed to both Floodlight tags and the ad tags running in apps. Campaign Manager uses the identifiers to uniquely identify a user and attribute app activities back to the in-app ads they viewed or clicked on.
Read more here: https://support.google.com/campaignmanager/answer/4568975