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What is the range of the coefficients of hydrodynamic resistances for the rounded edges at inlet?

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What is the range of the coefficients of hydrodynamic resistances for the rounded edges at inlet?

(a) 12-20 * 10^-3

(b) 10-20 * 10^-3

(c) 15-20 * 10^-3

(d) 12-30 * 10^-3

I got this question in final exam.

Asked question is from Design of Fan in division Aspects of Design of Mechanical Parts of Design of Electrical Machines

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Right option is (a) 12-20 * 10^-3

The explanation: The coefficients of hydrodynamic resistances are used in the calculation of the total head. For rounded edges the range is about 12-20 * 10^-3.

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