Protected data sets and business objects that support roll back

Summary

Looking for information on list of Business objects which are protected data sets and which supports roll back

Content

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20B release notes has feature of "DELETE PROTECTED DATA SETS". Per release notes and MOS Doc ID 2671180.1 "A data set is automatically protected when it contains business objects that support being rolled back"

I have below mentioned questions on this topic:

1. Where can I find the list of Business objects which are Protected Data Sets?

2. What does the roll back exactly means here?

3. How does the data get roll back and what are the steps to roll back?

Posting this question for information and understanding and will appreciate information on this topic with pointers to oracle documentation on this topic