Final answer:
Maintaining private property is not considered a major function of government according to functionalism.
Step-by-step explanation:
The question asks which of the provided options is not a major function of government. According to functionalism, a sociological perspective, governments have four main purposes: planning and directing society, meeting the needs of the people of the society, maintaining law and order, and managing international relations. The correct option that is not a major function of government, as per functionalism, is maintaining private property. The other options provided - keeping the population in order (maintaining law and order), providing security for the people, and providing services for citizens - are all recognized as primary functions of government.