Technician A says that the pitch line diameter of a spur gear exceeds its root diameter. Technician B says that when a pair of gears are properly in mesh, there should be contact between the apex (outside diameter) of each gear tooth with its opposite's root. Who is correct?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


Answer: A

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