Two technicians diagnose a head gasket failure. Technician A says that an exhaust analyzer can be used to check for HC or CO when the tester probe is held above the radiator coolant. Technician B says that a chemicalcoated paper changes color in the presence of combustion gases. Which technician is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
d. Neither Technician A nor B
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