Which of the following is a portable backup used for initial actions on a class bravo fire?

The correct answer is determined by understanding the types of portable fire extinguishing agents available for initial actions on a class Bravo (flammable liquid) fire.

Portable PKP (Potassium Bicarbonate) and Portable AFFF (Aqueous Film-Forming Foam) are both effective agents for suppressing class Bravo fires. PKP is a dry chemical that works by interrupting the chemical reaction of the fire, while AFFF creates a film that suppresses vapor and cools the burning liquid, making them suitable for these specific fire types.

Portable CO2 (Carbon Dioxide), while also a fire extinguishing agent, is generally not recommended for large-scale flammable liquid fires as it can be less effective in extinguishing them compared to PKP and AFFF. It is better suited for electrical fires or small flammable liquid fires.

Given that both PKP and AFFF are effective for initial firefighting actions on class Bravo fires, selecting both B and C acknowledges the importance of employing the correct agents for this type of fire scenario. Therefore, recognizing the specific roles and effectiveness of these substances leads to the decision that both PKP and AFFF are the appropriate choices when responding to class Bravo incidents.