Los análisis de superposición te permiten generar insights al comparar diferentes grupos de valores __________ de forma aislada y cuando se superponen.

Overlap analysis in Amazon Marketing Cloud (AMC) focuses on understanding the commonalities and differences between audience segments. To achieve this, you need a persistent identifier that can link activities across various datasets and campaigns. userid (user ID) is the correct answer because it uniquely identifies individual users, allowing you to track their behavior and understand how different groups of users overlap in their interactions with your marketing efforts. impressionid identifies a specific ad impression, not a user, so it cannot be used to compare user groups. requesttag is a custom tag for specific requests, not a user identifier. compras (purchases) represents an event, not a persistent user identifier, and while you can analyze purchases by user, the core of overlap analysis relies on the user ID itself to define the groups being compared.