Reynolds number for non - circular cross-section is:[V = mean velocity, ν = kinematic viscosity, P = ratio of cross-sectional area to the wetted perimeter]A) \(V.\frac{{4P}}{v}\)B) \(\frac{{V.P}}{v}\)C) \(\frac{{V.2P}}{{4v}}\)D) \(\frac{{V.P}}{{4v}}\)

• A. Only A
• B. Only B
• C. Only C
• D. Only D