Concept:Maintenance of law and order is an executive function carried out by security and enforcement agencies, not by the legislature.
Explanation:The police maintain internal order and enforce criminal law.
Immigration officers enforce border and immigration laws.
The prison service ensures the custody and correction of convicted offenders.
The legislature is the law-making organ of government.
It creates laws but is not responsible for enforcing or maintaining order on a daily basis.
Therefore, among the listed bodies, the legislature is the exception.
Answer:C. the legislature