Sources questions

[Fenris447]

Question 1
If a thing has multiple sources selected for it, does that mean the thing is available if any of those sources are checked, or do all of the sources have to be checked for it to be available? I assume it's the former, but I want to be sure.

Question 2
When adding things like races and new racial abilities (mainly for adding monsters), is it standard practice to just label the base race with the source, not all the racials and things bootstrapped to it? I assume so, since theoretically the racials would only show up if the race is selected.