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If the resistors of star connected system are ZR, ZY, ZB then the impedance ZBR in delta connected system will be?

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If the resistors of star connected system are ZR, ZY, ZB then the impedance ZBR in delta connected system will be?

(a) (ZRZY + ZYZB + ZBZR)/ZY

(b) (ZRZY + ZYZB + ZBZR)/R

(c) (ZRZY + ZYZB + ZBZR)/ZB

(d) (ZRZY + ZYZB + ZBZR)/(ZB+ZR)

I had been asked this question in semester exam.

The above asked question is from Star to Delta and Delta to Star Transformation topic in chapter Polyphase Circuits of Network Theory

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Correct answer is (a) (ZRZY + ZYZB + ZBZR)/ZY

To explain I would say: After transformation to delta, the impedance ZBR in delta connected system will be (ZRZY + ZYZB + ZBZR)/ZY.

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