I want to know the answer to the following question:
What was the Achaemenid Empire's official language?
All the background I'm provided with is that "In Greek history, the Achaemenid Empire is considered as the antagonist of the Greek city states, for the emancipation of slaves including the Jewish exiles in Babylon, building infrastructures such as road and postal systems, and the use of an official language, the Imperial Aramaic, throughout its territories.". Is that enough to answer the question?
Answer: yes