The United States Has Two Court Systems,state and Federal

The United States has two court systems,state and federal.The federal system

A) has discretionary jurisdiction over all cases arising in the state system.
B) is the only one with appellate courts.
C) is the only one based on the constitutional doctrine of the separation of powers.
D) is the only one that has judges who are appointed to office.
E) None of these answers is correct.