Two Technicians Are Explaining SCR (Selective Catalyst Reduction) Operation

Two technicians are explaining SCR (selective catalyst reduction) operation. Technician A says that after the urea decomposes into ammonia in the mixing chamber, the ammonia-exhaust gas composition passes over an SCR catalyst containing either copper or iron to break apart NOx molecules. Technician B says that blades or screens in the mixing device are used to create exhaust gas turbulence ahead of the mixing chamber. Who is right?

A) A only"
B) B only"
C) Both A and B
D) Neither A nor B"

Correct Answer:

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