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

A

0.529 cm

B

0-053 cm

C

0.525 cm

D

0.521 cm