Which among the following methods for estimation of convective heat transfer coefficient are having some limitations? (1) Analogy between heat, mass and momentum transfer (2) Dimensional analysis coupled with experimental data (3) Approximate analysis of the boundary layer equation (4) Exact mathematical analysis of the boundary layer equation

• A. (1), (2) and (3)
• B. (2), (3) and (4)
• C. (1), (2) and (4)
• D. all of the given (1), (2), (3) and (4)