Surveying Levelling

Which of the following expressions is correct to calculate the correction for curvature (Cc) in levelling? Where, d is the distance sighted (measured in km).

1
Cc = 0.6782d2 m
2
Cc = 0.5459d2​ m
3
Cc = 0.07849d2​ m
4
Cc = 0.02498d2​ m

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