Two technicians are discussing the markings on the heads of bolts (cap screws). Technician A says the higher the number of lines, the higher the strength of the bolt. Technician B says the higher the number on metric bolts, the higher the grade. Which technician is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
d. Neither Technician A nor B
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