Look at the bolt head shown in the figure below.        Auto Technician A says this bolt is an English-sized bolt. Auto Technician B says the bolt is a grade 5 bolt. Which one of the following statements is correct? A. Both Technician A and Technician B are correct. B. Only Technician A is correct. C. Only Technician B is correct. D. Neither Technician A nor Technician B is correct.