Step 1: Understanding communication types.
Formal communication is defined as the official, structured method used within an organization, often documented for record-keeping. It adheres to organizational hierarchy and protocols.
Step 2: Interpreting the scenario.
Naman, being the CEO, used the intercom—a formal communication channel—to instruct Vineet. Hence, this was a formal communication.
Conclusion: The correct answer is (A) Formal Communication.