You must add a new application to a RemoteApp application group so the application is available only during an active user session. What should you use as the application source?

App Attach is the correct choice because it allows applications to be dynamically attached to a user session when needed, without requiring them to be installed directly on the session host image. This makes the application available only during an active user session. FSLogix Profile Container manages user profiles and settings, not application delivery. A file path refers to an application executable directly on the session host, meaning it would be permanently available, not just during an active session. The Start Menu is a display mechanism for applications already available on the session host, not a source for dynamic application delivery.