Which fields must a developer specify to add and configure an additional device in the XM Cloud Pages editor?

To add and configure an additional device in the XM Cloud Pages editor, specifying the device width, visibility, and an icon to represent the device is essential. The width of the device is crucial because different devices can have varying viewport sizes, which affect how content is rendered on the screen. By defining the visibility, developers can control when and how the device will be shown to users, ensuring that it only appears in appropriate contexts. The icon serves as a visual representation of the device, which is important for clear identification within the editor, aiding in making design decisions and providing a better user experience during the editing process.

Other options do highlight certain useful components, but they either miss critical attributes like visibility or do not focus on the essential elements required for proper device definition within the context of the XM Cloud Pages editor.