Which of the following is not related to planning function?

The correct answer is option 4- Assigns duties.

"Assigns duties" is not directly related to the planning function. While planning involves setting objectives, making decisions, and is a primary function of management, assigning duties is more closely associated with the organizing function of management. Assigning duties typically occurs after the planning phase, where plans are put into action through the organization of resources and delegation of tasks. Thus, assigning duties is a part of organising function of management.