What happens if no audience is selected for a recommendation?

When no audience is selected for a recommendation, it means that there are no specific criteria limiting who can view that recommendation. In this case, all members of the site will see the recommendation because the absence of restrictions allows it to be displayed universally. This design is intentional, allowing administrators to ensure that important recommendations can be viewed by all users without needing to set specific audience parameters.

The other options would incorrectly suggest scenarios that are not supported by the functionality of audience targeting. For instance, stating that the recommendation will not be shown to any users would imply that there is a default block on visibility, which is not the case when no audience is specified. Similarly, limiting visibility to only external users or restricting it to a mobile version fails to align with how audience parameters are structured. Thus, the correct understanding is that lack of audience selection results in visibility to all members.