Hi D,
Great question! This method can be used for a variety of interactions - whenever you want to allow something only after all conditions have been met.
Basically, you need to check when ANY of the RB values change (multiple triggers), and then create a condition that checks to see if ALL the RBs are not blank (condition).
Here's a video walkthrough -
https://share.suddenlysmart.com/public/support/enable-submit-when-all-things-answered.mp4Hope that helps!