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What is the formula for the net cross sectional area of the core of the transformer?

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What is the formula for the net cross sectional area of the core of the transformer?

(a) cross sectional area = voltage per turn * 4.44 * frequency * magnetic field

(b) cross sectional area = voltage per turn / 4.44 * frequency * magnetic field

(c) cross sectional area = voltage per turn * 4.44 / frequency * magnetic field

(d) cross sectional area = voltage per turn * 4.44 * frequency / magnetic field

I got this question by my college professor while I was bunking the class.

My question is from Overall Dimensions in division Design of Transformers of Design of Electrical Machines

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Correct option is (b) cross sectional area = voltage per turn / 4.44 * frequency * magnetic field

Best explanation: For obtaining the cross sectional area, the voltage per turn is obtained. The frequency is always 50 Hz. Then the magnetic field is obtained and substituted in the above formula.

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