A coolant fluid at 30 C flows over a heated flat plate maintained at a constant temperature of 100 C. The boundary layer temp distribution at a given location on the plate may be approximated as

T=30+70 exp(−y), where y (in m) is the distance normal to the plate and T is in C. If the thermal conductivity of the fluid is 1.0 W/mk, the local convective heat transfer (in W/m^2.K) at that location will be A. 0.2 B. 1 C. 5 D. 10