Hot spots found on the cylinder bore near the exhaust valve indicate that the engine has experienced some localized overheating. technician a says that the hot spots are signs of cylinder bore damage and should be repaired through a resizing process. technician b says the hot spots are nothing more than carbon stains left by the vaporization of oil on the cylinder bore. who is correct?
a) technician a
b) technician b
c) both technician a and b
d) neither technician a nor b