Explanation
A page header is a component that appears at the top of every page on a Digital Experience site, and usually contains the site logo, the site name, the navigation menu, and other elements that provide a consistent and recognizable look and feel for the site. A UX Designer can code the page header to update the logo for Cloud Kicks by using the Experience Builder or the Developer Console1. The Experience Builder is a point-and-click tool that allows creating and customizing the page header using predefined templates, themes, and components. The Developer Console is a code editor that allows creating and editing the page header using HTML, CSS, JavaScript, and Lightning components2. Both tools provide the option to upload and insert the new logo image file into the page header, and to adjust its size, position, and alignment.
The other two options, Visualforce pages and email templates, are not the places where the UX Designer needs to code to update the logo for Cloud Kicks. Visualforce pages are web pages that can be used to create custom user interfaces for Digital Experience sites, but they do not affect the page header, which is a separate component that can be added to any page3. Email templates are predefined layouts and content that can be used to send emails to the site users, but they do not have any impact on the site appearance or functionality.
References: Create a Custom Header for Your Site | Salesforce Trailhead and Customize Your Site Header and Footer | Salesforce Trailhead