The local heat transfer coefficient is minimum at point

Question

Consider a two-dimensional laminar flow over a long cylinder as shown in the figure below.

The free stream velocity is $U_{\infty }$and the free stream temperature $T_{\infty }$ is lower than the cylinder surface temperature T_s. The local heat transfer coefficient is minimum at point.                                                               

      (a) 1                                (b) 2                             (c) 3                                (d) 4