Afederal system of government has
o a.
free and fair elections
b.
a written constitution
oc. socialization through education
od. layers of government

The right answer is "all of the above."

Explanation:

Look at the United States. It´s a country with a federal system of government. It shows the four characteristics listed here.  Another examples are Brazil and Germany. They also have federal systems  and meet all those requirements.

classical republicanism, also known as civic humanism, is a form of republicanism  developed in the renaissance inspired by the governmental forms and writings of  classical  antiquity, especially such  classical  writers as aristotle, polybius, and cicero.