[Solved] Which of the following statements is LEAST-Likely true? A)The first few minutes of an engine's operation are critical to its long life. B)A new part might look quite smooth to the naked eye.Compared to a used, worn-in part, however, it is quite rough. C)Heavy engine loads should be encouraged during break-in. D)Moving parts are continuously separated by a film of oil; only the peaks on rough surfaces touch. Threshold of Excitation: The minimum level of stimulus intensity required to activate a neuron and generate an action potential. Electric Current: The flow of electric charge through a conductor. Absolute Refractory: A period immediately following the transmission of an impulse in nerve or muscle in which a neuron or muscle cell cannot respond to any additional stimulus. Period: Often refers to a length or span of time in a sequence of events or a specified interval in processes or phenomena.