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When two ends of a rod wrapped with cotton are maintained at different temperatures and after some time every point of the rod attains a constant temperature, then

(a) Conduction of heat at different points of the rod stops because the temperature is not increasing

(b) Rod is bad conductor of heat

(c) Heat is being radiated from each point of the rod

(d) Each point of the rod is giving heat to its neighbour at the same rate at which it is receiving heat