Exploring a pipeline in the Airflow UI

A Dag called explore_pipeline has been loaded into the Airflow UI but has not been triggered yet. In practice, the first thing you do with an unfamiliar pipeline is run it and inspect its structure in the UI. You'll do exactly that here.

Follow these steps:

1. In the Dags view, toggle explore_pipeline on.
2. Click the play icon and select Single Run to trigger it.
3. Once the run completes, open the Graph view.

Looking at the Graph view, which of these tasks is NOT part of the explore_pipeline Dag?