When the pressure drop across a converging-diverging nozzle is different from the design value for isentropic flow, which of the following is possible?

• A. There is one normal shock in converging part and one normal shock in the diverging part
• B. There is only normal shock in the converging part and none in the diverging part
• C. There is only one normal shock in the diverging part and none in the converging part
• D. There are two or more normal shocks, depending on the pressure drop, in the diverging part and none in the converging part