Surveying Levelling

If ‘k’ is the total distance of the level line in km, then the permissible error in the first order precise leveling is:

1
\(\pm \ 8\sqrt{k} \ mm\)
2
\(\pm \ 4k \ mm\)
3
\(\pm \ 4\sqrt{k} \ mm\)
4
\(\pm \ 8 k \ mm\)

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