I noticed that the Activity ID is visible for some activities, but not others, in the Activity Overview screen.What steps are required before the Activity ID displays on that screen? Do I need to take the activity to a certain point in the process?

The "Create a Multivariate Test" documentation and the Adobe Target UI suggest that Visual Experience Composer is required to run Multivariate Tests. Is this true? Can I instead setup and run a MVT with JSON Offers or anything other than VEC? https://experienceleague.adobe.com/docs/target/using/acti...