Surveying Levelling

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

1
Cc = 0.05658 d2 m
2
Cc = 0.07849 d2 m
3
Cc = 0.01121 d2 m
4
Cc = 0.06728 d2 m

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