Are reviews shared across learn centers

Summary

If a course is inserted into more than one sub, are the reviews shared

Content

If you have reviews enabled in your main learn center, do you have to also enable them in the sub learn centers or does it cascade?

If a course is reviewed in both the sub learn and main, when the average rating is calculated, does it use both?

Can users see all reviews, even those not in their learn center (assuming the course is in their learn center)?