What is the error in feet for precise levelling for benchmarks of widely distrib

Question

What is the error in feet for precise levelling for benchmarks of widely distributed points?

Options:

A . 0.4×√M

B . 0.1×√M

C . 0.05×√M

D . 0.017×√M

Answer: Option D
Answer: (d).0.017×√M

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