What feature allows users to adjust fixed bids for different geographies or device types?
Partner revenue model
The correct answer is:
Use bid multipliers to automatically increase or decrease a line item’s fixed CPM bid based on different criteria. This makes it possible to have a single line item for many different contexts, rather than using multiple line items for each permutation of your targeting.
Read more here: https://support.google.com/displayvideo/answer/7378954