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The levels of the federal court system are
a. appellate courts, the U.S. Supreme Court, and state supreme courts.
b. municipal court, intermediate U.S. courts of appeal, and the U.S Supreme Court.
c. the state municipal court, U.S. district courts, and the U.S. Supreme Court.
d. U.S. district courts, intermediate U.S. courts of appeal, and the U.S. Supreme Court.
e. city courts, state courts, and the U.S. Supreme Court.
What is d. U.S district courts, intermediate U.S. courts of appeal, and the U.S. Supreme Court