How Did the Persian Empire Attack the Greek States That

How did the Persian Empire attack the Greek states that had allied against Persia during the Persian Wars of 499 through 479 B.C.E.?
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A) By sailing directly west into Athens to attack the coastal city-states.
B) By meeting Greek naval ships in the middle of the Aegean Sea.
C) By traveling north and west over land, then south through Macedonia and Thessaly into the Greek states.
D) By sailing south around Crete, then up into Peloponnese to attack.