The correct answer is option 'A' - Federal Government.

Explanation:
A federal government is a system of government that divides power and authority between a central government and multiple regional or state governments. This means that there are two or more levels of government within the country or state.

Here is a detailed explanation of each option:

a) Federal Government: In a federal government system, power is shared between the central government and regional or state governments. The central government is responsible for national issues such as defense, foreign affairs, and currency, while the regional or state governments have authority over local matters such as education, healthcare, and transportation. Examples of countries with a federal government system include the United States, Canada, Australia, and Germany.

b) Coalition Government: A coalition government is a form of government where multiple political parties come together to form a governing body. This usually occurs when no single party has won a majority in an election. While a coalition government can involve multiple parties, it does not necessarily involve multiple levels of government. The power and authority are still centralized within a single government.

c) Community Government: Community government refers to a system where local communities have a certain degree of self-governance within a larger political structure. However, it does not necessarily involve multiple levels of government. The power and authority may still be centralized within a single government, but with some decision-making powers delegated to local communities.

d) Unitary Government: In a unitary government system, power is centralized within a single government, and there are no separate levels of government. The central government has supreme authority and can delegate certain powers to local administrations, but it can also revoke those powers if needed. Examples of countries with a unitary government system include France, China, and Japan.

In conclusion, the only option that involves two or more levels of government is a federal government system (option A). The central government and regional or state governments share power and authority, making it a multi-level system of governance.