The correct answer is: a) Unitary.
A unitary government is a form of government in which the central government holds all power. The central government can delegate some powers to local governments, but the local governments are ultimately subordinate to the central government.
A federal government is a form of government in which power is shared between the central government and the state governments. The central government and the state governments are both sovereign, but the central government has more power than the state governments.
A confederal government is a form of government in which the central government is weak and the state governments are strong. The state governments are sovereign and the central government can only act with the consent of the state governments.
A presidential government is a form of government in which the head of state is also the head of government. The president is elected by the people and is responsible for appointing the cabinet and other government officials.
Andhra Pradesh is a state in India with a unitary form of government. The central government in India is the Union Government, which is headed by the Prime Minister. The state government in Andhra Pradesh is headed by the Chief Minister. The Union Government has more power than the state government, but the state government has some autonomy in matters such as education, health, and agriculture.