If you are using Google Ads Search Ad Remarketing then your user cookies should have a minimum audience list size of 1000. These list sizes allow Google Analytics to identify a pattern in the user behavior of the audience so that can be remarketed afterward.
For Google Display Network, the minimum list size is 100. For YouTube, the minimum list size is 1000.
This question is a part of the Assessment 4 section of the Advanced Google Analytics Certification course. You can find the answers with full explanation for the fourth Assessment in our Advanced Google Analytics Assessment 4 Answers page or you can check out the answers for all the assessment questions in our Advanced Google Analytics Assessment Answers page.