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What is the relationship between line and phase current in Star connection with the positive sequence?

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What is the relationship between line and phase current in Star connection with the positive sequence?

(a) VL=Vp

(b) VL=√9Vp

(c) VL=√2Vp

(d) IL=Ip

I got this question in examination.

My question is taken from Power Rating Determination of Electric Motors for Different Applications in division Rating and Heating of Motors of Electric Drives

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The correct option is (d) IL=Ip

The best I can explain: In the star connection line current is the same as the phase current. The line voltage is √3 times of the phase voltage and leads by 30°.

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