Chain of command refers to

• A. Order of rank and authority in the fire and emergency services
• B. Process for requesting water supply
• C. Calendar for shift changes
• D. Procedure for radio checks

Answer: (A)

Chain of command is the order of rank and authority within fire and emergency services, and it defines who has authority and who reports to whom. This structure determines how leadership and decisions flow from top to bottom, ensuring clear directions, accountability, and coordinated action during emergencies through the incident command system. The other options describe specific tasks or schedules (like requesting water supply, shift calendars, or radio checks) rather than the organizational hierarchy that establishes who leads and who follows.