What does interoperability with third-party ad IDs allow advertisers to do?

The correct answer is Expand the supply they have access to and improve overlap rates because interoperability with third-party ad IDs allows advertisers to access a broader range of inventory across different platforms, which can lead to higher supply availability. Additionally, this integration can improve overlap rates by helping to match audiences across various sources, ensuring that advertisers can target users who are more likely to be interested in their products or services based on a more comprehensive set of data. By utilizing third-party ad IDs, advertisers can tap into new inventory and cross-platform audience insights, which enhances the effectiveness of their campaigns. The other options do not directly relate to the expanded inventory or overlap improvements that result from using third-party ad IDs.