A software company wants to re-engage users who've previously visited their website but didn't sign up. Which data segment should they use?

Remarketing is the correct choice because it specifically targets users who have previously interacted with a business, such as visiting their website. This allows the software company to re-engage those who showed initial interest but didn't convert (sign up). Lookalike audiences are used to find new users who share characteristics with existing customers, not to re-engage past visitors. In-market audiences target users actively researching or planning to purchase products or services, which is broader than re-engaging past site visitors. Detailed demographics segment users based on broad characteristics like parental status or education, not their past website behavior.