Which the following statements pertaining to heat transfer through fins?

A) Fins are equally effective irrespective of whether they are on the hot side or cold side of the fluid B) The temperature along the fin is variable and hence the rate of heat transfer varies along the elements of the fin
C) The fins may be made of materials that have a lower conductivity than the material of the wall D) Fins must be arranged at right angles to the direction of the flow of the working fluid

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