The best option is the third one:
Label A: Court of original jurisdiction.
Label B: Appellate Court.
Explanation:
The U.S. Federal court system hast three levels:
1) District courts: No appellate jurisdiction and original jurisdiction over most cases; 94 judicial districts in 50 states and territories.
2) Courts of Appeal (or Appellate Court): 12 regional circuit courts, including D.C. circuit.
3) Supreme Court: Nine justices, meeting in Washington D.C.; Appeals jurisdiction through certiorari process.