While Rebuilding the 4th Gear Clutch Pack, You Measure the Clutch

While rebuilding the 4th gear clutch pack, you measure the clutch pack clearance and find it is 0.020 inches (0.508 mm) . Tech A states that the wave washer must be changed to correct the clutch pack clearance. Tech B states that the clutch is assembled incorrectly. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B