Technician a Says Diesel Exhaust Oxidation Catalysts Used by Diesel

Technician A says diesel exhaust oxidation catalysts used by diesel engines are like those used in automobiles for the last two decades. Technician B says diesel exhaust oxidation catalysts will store noxious emissions in the substrate when the exhaust temperatures are low. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B