High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ?H and ?S respectively for this process ?

A. ? H = 0 and ?S = 0

B. ? H ? 0 and ?S = 0

C. ? H = 0 and ?S ? 0

D. ? H ? 0 and ?S ? 0

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