What are the three main subsystems of a typical fire alarm system?

What are the three main subsystems of a typical fire alarm system?

• A. Initiating devices, power supply, and signaling devices
• B. Initiating devices, fire alarm control panel, and notification appliances (with power supply and circuits like SLC/NAC/IDC)
• C. Fire suppression equipment, building automation, and security devices
• D. Control panel, wiring, and sensors

Answer: (B)