Which of the following is NOT one of the four functions of management?

Marketing is not considered one of the four fundamental functions of management. The primary functions identified in management theory include planning, leading, organizing, and controlling. These functions are essential for effective management within an organization.

Planning involves setting goals and determining the best course of action to achieve them. Leading encompasses motivating and guiding employees to work towards the organization's objectives. Controlling is about monitoring performance, comparing it with established standards, and taking corrective actions when necessary. While marketing is a crucial business activity that focuses on promoting and selling products or services, it does not fall within the core functions of management that address how to effectively manage an organization and its resources. Hence, marketing is not one of the four functions of management.