An advertiser wants to expand their reach using audiences that don't rely on cookies. Which of the following should they choose that best meets these requirements?

The correct answer is Similar audiences because similar audiences are based on characteristics and behaviors that do not rely on cookies for tracking. These audiences are created by analyzing the data from an advertiser’s existing customer base, looking for patterns or similarities in behavior, rather than relying on tracking users via cookies across the web. This approach allows advertisers to expand their reach to new potential customers who exhibit similar behaviors or characteristics to their current audience, without needing to track individual users using cookies. In contrast, third-party audiences and lookalike audiences often rely on cookies for tracking users' online activities to identify and target individuals, making them less suitable for cookie-free strategies.