Experience Fragments in AEM can be exported to Adobe Target, and the default format for this export is HTML. When Experience Fragments are exported to Adobe Target, they are typically used for personalization and A/B testing. HTML is the format that is readily usable within Adobe Target to create variations of a page or a component for these testing purposes.

XML (Option B) and JSON (Option C) are not the default formats for exporting Experience Fragments to Adobe Target. While they can represent structured data, for the purposes of visual personalization in Adobe Target, the HTML format is used because it can directly represent the markup required for the content to be rendered in a browser.