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What is the formula for the area of cross-section of each damper bar?

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What is the formula for the area of cross-section of each damper bar?

(a) area of cross section of each damper bar = total area of bars per pole – number of damper bars per pole

(b) area of cross section of each damper bar = total area of bars per pole + number of damper bars per pole

(c) area of cross section of each damper bar = total area of bars per pole / number of damper bars per pole

(d) area of cross section of each damper bar = total area of bars per pole * number of damper bars per pole

This question was posed to me in an interview.

My query is from Design of Rotor in section Design of Synchronous Machines of Design of Electrical Machines

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Right choice is (c) area of cross section of each damper bar = total area of bars per pole / number of damper bars per pole

To explain: The total area of bars per pole is first obtained. Next the number of damper bars per pole is calculated and the ratio gives the area of cross section of each damper bar.

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