What should the Release Train Engineer do during the final plan...

What should the Release Train Engineer do during the final plan review on Day two of Program Increment (PI) Planning?

1. Verify that each team's uncommitted objectives have lower business value than the committed PI objectives in order to reflect proper prioritization
2. Facilitate all teams when they are presenting their final plans to the entire Agile Release Train
3. Facilitate the ROAMing of the each team's risks
4. Encourage discussion of each team's product Vision as part of the final plan review