For a counter current heat exchanger with Ti h = 80C, Tc = 60C, Th = 50C and Ti c = 30C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy___________________?

A. dT/dZ = 0

B. d2T/dZ2 = 0

C. d2T/dZ2 < 0

D. d2T/dZ2 > 0

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