old exam.. can you help in this one please?

Assume that you are in charge of a large LPG (liquefied petroleum gas) storage unit. You are asked to design the storage tank. a) Based on your knowledge on heat transfer, which shape would you select for the storage tank? Your options are: cylinder, sphere, cube. Explain your reasoning. [20 pts] Clue: The volume to surface area ratio of these shapes are as follows: sphere > cylinder > cube b) For the selected shape, identify all the modes of heat transfer that occurs between the atmosphere and the LPG inside the tank. Specify all the thermal resistances (no equation needed). [20pts] c) Suggest all the design considerations to ensure minimum heat transfer between the surroundings and the fluid inside the tank. [10 pts]