Plzz

what was the final ruling in the dred scott case in the u. s. supreme court?
a. under federal law, dred scott was no longer a slave because he had lived in a free state and a free territory
b. under federal law, dred scott was still a slave since he moved back to missouri, which was a slave state
c. under missouri law, dred scott was still a slave, despite having lived in a free state and a free territory
d. under missouri law, dred scott was not a slave since he gained his freedom by having lived in a free state and a free territory