All of the following are components of a topic cluster EXCEPT:

A topic cluster is a content strategy designed to improve SEO and user experience by organizing content around a central theme. The core components of a topic cluster include pillar content, which serves as a comprehensive guide on a particular subject, and related content, which consists of supporting articles or blog posts that delve into specific aspects of that theme. Internal linking strategies are also integral to topic clusters, as they help connect the pillar content to the related articles, enhancing navigation and increasing the likelihood of ranking higher in search engine results.

Distribution channels, such as YouTube or Twitter, do not form part of the topic cluster structure itself. Instead, they serve as platforms for promoting the content created within the topic cluster. While promoting content on these channels can drive traffic and improve visibility, they are not components of how the topic cluster is organized or structured. Therefore, the correct answer highlights the distinction between the content's organization and the channels through which it may be distributed.