In the Supreme Court's decision in Korematsu v. United States (1944), the court upheld the government's decision to intern Japanese Americans during World War II, deeming it a wartime necessity. The ruling essentially stated that the need to protect against espionage outweighed Korematsu's individual rights at that time.
Therefore, among the options you've provided, none are entirely accurate in terms of the court's ruling, but the closest interpretation would be that the court did not exonerate Korematsu but upheld the internment policy based on the perceived threat during the war. The correct answer is none of the above as they do not directly reflect the court's conclusions or language in its decision.