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What is the formula of the actual ratio?

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What is the formula of the actual ratio?

(a) actual ratio = turns ratio + load current * secondary current

(b) actual ratio = turns ratio * load current * secondary current

(c) actual ratio = turns ratio + load current / secondary current

(d) actual ratio = turns ratio / load current * secondary current

I had been asked this question in a job interview.

My question is from Turns Compensation topic in chapter Design of Current Transformers (CT) of Design of Electrical Machines

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The correct option is (c) actual ratio = turns ratio + load current / secondary current

Explanation: The turns ratio is first calculated. Next the load current and secondary current is calculated and on substitution gives the actual ratio.

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