we already have 2 that have been discussed (there are at least 2 in the article you linked)
you've also added a qualifier that it depends on other things too so that adds at least a 3rd variant to the mix (actually at least a 4th since you've identified "dynamics of a country" and "history")
I've also seen adaptations of Critical Race Theory that posit it can only be white people (regardless of majority status) or that by virtue of being white you are inherently racist. So that's 2 more constructions. So there's at least 6 different constructions.
Personally, I subscribe to the individual action view where prejudice based on a believe another race is inferior counts as racism.