Technician A says that the one of the most common causes of DPF failure is thermal stress during normal regeneration cycles.  Technician B says that a crack in the DPF substrate immediately renders the device useless. Who is correct??

A. ?Technician A only
B. ?Technician B only
C. ?Both A and B
D. ?Neither A nor B


Answer: C

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Fill in the blank(s) with the appropriate word(s).

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