What configuration setting eliminates duplicate conversions between advertisers?
Shared Floodlight configuration
The correct answer is:
Each Search Ads 360 advertiser and its associated Campaign Manager advertiser share the same set of Floodlight settings, activities, and tags used to report conversions. This makes it possible to track conversions from both display and search advertising using a single set of tags. It also prevents cross-channel conversion funnels from counting conversions more than once (for example, conversions that start from a display click and end with a paid search click will give last-click credit to the paid search click).
Read more here: https://support.google.com/searchads/answer/2478311