The uploaded study guide specifies B. Page headers as the correct answer. A corporate logo is a persistent identity element normally associated with the site's header or theme-level branding area. In an Experience Cloud site, the logo should therefore be implemented within the portion of the experience responsible for global page identity rather than unrelated content channels.
Salesforce's Experience Builder documentation confirms that images can be uploaded and selected for areas including the header and logo, with those assets stored for reuse within the site's asset library. This aligns directly with the purpose of a prominent site-wide brand logo.
Visualforce pages would only be appropriate where a specific custom Visualforce implementation requires its own markup. Updating separate Visualforce pages would also risk inconsistent branding across the experience. Email templates control outbound email presentation and have no role in displaying the primary logo in the Digital Experience site's interface.
From a UX standpoint, common branding elements should be located at the appropriate global or reusable presentation level. This provides consistency, maintainability, and predictable placement across pages.
Accordingly, the page header is the correct target for prominently incorporating the updated company logo.
Study Guide reference/topics: Experience Cloud branding, page headers, logo placement, reusable site elements, Declarative Design.
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