Answer:
The correct answer is a) Federal system.
Step-by-step explanation:
Countries whose government organization is based on a federal system are characterized by being divided into independent states, but they are managed by federal power. The federal system tries to find a balance in national needs.
Generally, when there is a federal system, it is divided into three powers, these are the legislative, judicial and executive power, each of them has different functions, and it is the executive power that is managed by the president of the nation.
I hope this information can help you.