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Five rods of same dimensions are arrange...

Five rods of same dimensions are arranged as shown in figyre. They have thermal conductivities `K_(1), K_(2), K_(3), K_(4) and K_(5)`. When points A and B are maintained at different temperatures, no heat flows through the central rod if

A

`k_1=k_4`and`k_2=k_3`

B

`k_1k_4=k_2k_3`

C

`k_1k_2=k_3k_4`

D

`(k_1)/(k_4)=(k_2)/(k_3)`

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