If Da is diffusivity, CT is tracer concentration and UT is overall heat transfer coefficient, then the pulse tracer balance with dispersion is obtained as ____

• A. \(\frac{∂^2 C_T}{∂z^2} – \frac{∂U_T}{∂z} = \frac{∂C_T}{∂z} \)
• B. Da\(\frac{∂^2 C_T}{∂z^2} – \frac{∂U_T}{∂z} =\frac{∂C_T}{∂z} \)
• C. Da\(\frac{∂^2 C_T}{∂z^2} + \frac{∂U_T}{∂z} =\frac{∂C_T}{∂z} \)
• D. Da\(\frac{∂C_T}{∂z^2} – \frac{∂U_T}{∂z} =\frac{∂C_T}{∂z} \)