What should a marketer expect to see in test mode for data extension entry source journeys in Journey Builder?

In test mode for data extension entry source journeys within Journey Builder, a marketer should expect to see the inbox delivered email and the journey path for up to 10 contacts. This mode allows for simulation of how contacts will experience the journey after they enter it. The test mode provides visibility into how emails will appear in an inbox environment, offering insights on the journey's flow, which helps marketers assess and optimize their journey design.

The journey path enables marketers to visualize how each contact progresses through the various steps of the journey, including decisions and emails sent, allowing for real-time evaluation of journey performance. This simulation is critical for troubleshooting and ensuring the journey behaves as intended before being launched to a broader audience.

While other options suggest elements like email previews or in-app previews, they do not encompass the entire experience of tracking contact entries through the journey and seeing how they would actually receive communications. The correct answer reflects the comprehensive view of contacts' journeys, highlighting the dual focus on both delivery and navigation through the journey.