The order communication was Formal because:
1. Channel Characteristics: - Intercom (official workplace system) - Followed organizational hierarchy (CEO→Manager)
2. Content Nature: - Business-critical information (large order) - Revenue-impacting instruction
3. Context Indicators: - Despite personal relationship, used official channel - Task execution required formal record
Clarifications: - (B) Informal: Would involve personal channels (texts, casual talk)
- (C) Online: Too broad (intercom isn't internet-based)
- (D) Visual: No diagrams/charts used
Final Answer: (A) Formal Communication