What triggers a 'Code Red' communication?

What triggers a 'Code Red' communication?

• A. The Chief orders it after a routine check.
• B. A bystander reports a potential hazard.
• C. It is automatically triggered after 10 minutes of delay.
• D. The initial arriving fire company determines the need for a 'Code Red' and transmits it over the proper operating channel.

Answer: (D)