A furnace is of cylindrical shape with R = H = 3 m. The base, top, and side surfaces of the furnace are all black and are maintained at uniform temperatures of 450 K, 670 K, and 1300 K, respectively. Which of the following is true about the heat exchange?
a) The heat exchange occurs primarily through conduction.
b) The heat exchange occurs primarily through radiation.
c) The heat exchange occurs primarily through convection.
d) The heat exchange occurs equally through conduction, radiation, and convection.