A cylindrical pin of 25+0.010+0.020 mm diameter is electroplated,

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A cylindrical pin of 25^{+0.010^+0.020} mm diameter is electroplated, plating thickness is 2.0^±0.005mm. Neglecting the gauge tolerance, the diameter (in mm, up to 3 decimal points accuracy) of the GO ring gauge to inspect the plated pin is ____.

1. 9.030 mm.
2. 2.030 mm.
3. 29.030 mm.
4. 11.030 mm.

Correct Option: C

D = 25.02 + 2 × 2.005 = 29.030 mm.