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

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

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

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

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

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

I have been asked this question in an international level competition.

My question comes from Star to Delta and Delta to Star Transformation in division Polyphase Circuits of Network Theory

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Right choice is (d) (ZRZY + ZYZB + ZBZR)/ZR

The best explanation: After transformation to delta, the impedance ZBY in delta connected system will be  (ZRZY + ZYZB + ZBZR)/ZR.

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