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In a star connected system, the relation between VYB, Vph is?

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In a star connected system, the relation between VYB, Vph is?

(a) VYB = Vph

(b) VYB = 3√3Vph

(c) VYB = 3Vph

(d) VYB = √3Vph

This question was posed to me in an interview for internship.

My enquiry is from Voltage, Current and Power in a Star Connected System topic in section Polyphase Circuits of Network Theory

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The correct answer is (d) VYB = √3Vph

The explanation: In a star connected system, the relation between VYB, Vph is VYB = √3Vph. The line voltage VYB is equal to the phasor difference of VYN and VBN and is equal to √3Vph.

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