A 2-cm thick wall separates two rooms with temperatures of 20 °C and 10 °C respectively. The wall has a thermal conductivity of 0.1 (m)(K)W and a surface area of 10 m². What is the rate of heat transfer through the wall?
a. 50 W b. 250 W c. 500 W d. 1000 W e. 5000 W