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What Is the formula of the permeance of the flux tube considering unit depth in the flux plotting technique?

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What Is the formula of the permeance of the flux tube considering unit depth in the flux plotting technique?

(a) permeance of the flux tube = permeability in the air * mean width of flux tube * mean length of flux tube

(b) permeance of the flux tube = permeability in the air / mean width of flux tube * mean length of flux tube

(c) permeance of the flux tube = permeability in the air * mean width of flux tube / mean length of flux tube

(d) permeance of the flux tube =1/ permeability in the air * mean width of flux tube * mean length of flux tube

I got this question during an online exam.

My question is based upon Field Form, Harmonic Analysis of Flux Distribution Curve in portion Principles of Magnetic Circuit Design of Design of Electrical Machines

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Right choice is (c) permeance of the flux tube = permeability in the air * mean width of flux tube / mean length of flux tube

Explanation: The permeability in the air, mean width of the flux tube and the mean length of flux tube is calculated first. On substitution the permeance of the flux tube is obtained.

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