The communication regarding the order was categorized as Formal due to the following reasons:
1. Channel Characteristics: The communication utilized the Intercom, an official workplace system, and adhered to the organizational hierarchy (CEO to Manager).
2. Content Nature: The information conveyed was business-critical, pertaining to a large order and impacting revenue.
3. Context Indicators: Despite a personal relationship existing, the official channel was employed, and the task execution necessitated a formal record.
Clarifications: - (B) Informal communication would typically employ personal channels like text messages or casual conversation.
- (C) Online is too broad a category, as Intercom is not inherently internet-based.
- (D) Visual communication was not applicable as no diagrams or charts were utilized.
Final Answer: (A) Formal Communication