What does principle component analysis tell us about human genetic variation?

there is strong evidence for a genetic basis for continental races $($African$,$ Asian, etc$)$

people of African descent can be classified into $3$ "sub$-$races"

there is strong evidence for a genetic basis for traditional racial categories $($Black$,$ White, etc$)$

genetic variation does NOT overlap with continental origin or traditional racial categories

genetic variation does overlap with continental origin but NOT traditional racial categories