A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of -0.004 cm, the correct diameter of the ball is

1. A. 0.053 cm
2. B. 0.525 cm
3. C. 0.521 cm
4. D. 0.529 cm

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