Which of the following are true about a federal system?
A. A federal system is based on a constitutional division of power.
B. In a federal system the power remains centralized.
C. A federal system is an innovation of modern times to deal with the issues of mass democracies.
D. In a federal system the regional units participate in the decision-making process at federal level electorally.
E. It is characterized by primacy of territorial representation.
Choose the correct answer from the options given below: