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

A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?