Doubt from heat transfer

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This question was previously asked in jee advanced,the concept involved is Stephan-Boltzmann law.
The three plates radiate energy proportional to fourth power of its absolute temperature.
The middle plate absorb the radiation from other two plates and it also RE EMITS energy.
At steady state ,the total energy absorbed by the middle plate equals to the total energy it re emits.
Ans:c)

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