Step 1: Recall the three levels of management.
Every organisation is divided into Top, Middle, and Operational (Lower) levels, each with its own set of responsibilities.
Step 2: Understand what Top-Level Management does.
Top-level managers set the vision, frame overall policies, formulate broad organisational goals and strategies, and are ultimately responsible for the welfare and survival of the entire firm.
Step 3: Understand what Middle-Level Management does.
Middle managers act as a link between the top and lower levels. They interpret and implement policies passed down from the top, and they co-ordinate and co-operate with other departments to ensure smooth day-to-day functioning.
Step 4: Check each option against this understanding.
Option (B) being responsible for welfare and survival, Option (C) analysing the business environment, and Option (D) formulating goals and strategies are all classic duties of Top-Level Management. Option (A), co-operating with other departments for smooth functioning, is a classic duty of Middle-Level Management, not the top level.
Step 5: Identify the option that is NOT a top-level function.
Co-operating with other departments is explicitly assigned to middle-level managers because they are the bridge between departments. Top managers focus on the big picture, not inter-departmental co-ordination.
Step 6: Confirm the answer.
The question asks which function is NOT performed by Top-Level Management. That is Option (A).
\[ \boxed{ \text{(A) Cooperating with other departments for smooth functioning of the organisation.} } \]