Pick out the correct statement pertaining to the flow through a converging-diverging tube ?

Fluid Mechanics for Chemical 22/06/2021

A. The value of Mach number is always unity at the throat
B. No shock wave develops in the tube when the Mach number at exit is greater than unity
C. Throughout the converging portion of the tube, the density increases in the downstream
direction
D. None of these

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