What has the U.S. Supreme Court held regarding whether U.S.courts must rely on c

What has the U.S. Supreme Court held regarding whether U.S.courts must rely on customary international law?a. The U.S. Supreme Court has held that U.S.courts may disregard customary international law.b. The U.S. Supreme Court has held that even if agoverning international agreement says otherwise a U.S. court mustrely on customary international law.c. The U.S. Supreme Court has held that even if acontrolling executive act is to the contrary U.S. courts must relyon customary international law.d. The U.S. Supreme Court has held that in theabsence of a governing international agreement or controllingexecutive or legislative act or judicial decision U.S. courtsmust rely on customary international law.