Answer:
Technician B only is correct and Technician A is wrong
Step-by-step explanation:
Technician B only is correct and Technician A is wrong because
using lower octane fuel will only affect the power and does not damage the engine and some octane booster will discolor porcelain on the spark plug.
Octane number is figure indicating the antiknock properties of a fuel based on comparison with the mixture of isooctane and n-heptane
Hence we can say that Technician B only is correct and Technician A is wrong