Identify the components involved in the ERJ's fire protection system.

The fire protection system in the Embraer Regional Jet (ERJ) is designed to ensure safety during flight by detecting and suppressing fires promptly. The effectiveness of this system relies on both smoke detectors and fire extinguishers working together.

Smoke detectors are crucial components as they continuously monitor for signs of smoke, which can indicate the presence of a fire. They play a vital role in early fire detection, allowing for timely alerts to the crew.

Fire extinguishers complement this by providing the means to suppress any detected fire. In the ERJ, specialized fire extinguishers are strategically placed to respond to different types of fire hazards, especially in engine compartments and aft cargo areas.

While smoke detectors and fire extinguishers are both essential, the inclusion of alarms in the complete fire protection system enhances its effectiveness. Alarms alert the crew to the presence of smoke or fire, ensuring that they can take immediate action. Thus, a comprehensive fire protection system involves smoke detectors, fire extinguishers, and alarms, making the selection that includes all three components the most accurate representation of the ERJ's fire protection capabilities.