Concept Question: What energy balance expression is correct for an unsteady process of an open system? = - = " (a) (b) (c) (d) (e) (lout - in) + (Wout Win) + (mass mass ) = AU s dt Win + Wout + (Eimass mass ) = AU (Qin - Qout) + (Win - Wout) + (mass mass ) = 0 (Qin - Qout) + (Win Wout) + (Emass - Emass ) (AU) ) None of the above = in out d dt Ob Od e