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Which one of the following statements is correct about the Fanno flow?

a. For an initially subsonic flow, the effect of friction is to decrease the Mach number towards unity

b. For an initially supersonic flow, the effect of friction is to increase the Mach number towards unity

c. At the point of maximum entropy, the Mach number is unity

d. Stagnation pressure always increases along the Fanno line

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