What do the letter and number symbols, such as B-II, used to classify portable fire extinguishers indicate?

Correct Answer: Option A — class of fire and size of the extinguisher

Portable fire extinguishers use a letter and Roman numeral system under USCG standards, where the letter designates the fire class (A, B, C, or D) and the numeral indicates the relative extinguishing agent capacity and physical size.