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What is the equation for frequency of generated EMF?

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What is the equation for frequency of generated EMF?

(a) f = PN/120 Hz

(b) f = 120/PN Hz

(c) f = P/120 Hz

(d) f = N/120 Hz

The question was asked during an online exam.

The question is from Constructional Features of Rotating Electrical Machines-2 in portion Constructional Features of Rotating Electrical Machines of Electrical Machines

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The correct choice is (a) f = PN/120 Hz

To elaborate: f = PN/120 Hz in India and many other countries, alternators feeding the power system generates at a frequency of 50 Hz.

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