An automotive bolt has a designation of 1/2-13 UNC. Auto Technician A says this bolt is a coarse-thread bolt. Auto Technician B says the bolt has a diameter of 13 millimeters. Which one of the following statements is correct? A. Only Technician B is correct. B. Only Technician A is correct. C. Neither Technician A nor Technician B is correct. D. Both Technician A and Technician B are correct.
