which best describes county governments?\nthey are overseen by a mayor and department chairs.\nthey are…

which best describes county governments?\nthey are overseen by a mayor and department chairs.\nthey are established as outlined by the us constitution.\nthey have executive, legislative, and judicial branches.\nthey are established as outlined by a states constitution.
Answer
Brief Explanations:
County governments in the US are established as per a state's constitution. They don't have the same tri - branch structure as the federal or some state governments in a strict sense, and are not overseen by a mayor and department chairs in a typical way, nor are they outlined in the US Constitution.
Answer:
They are established as outlined by a state's constitution.