*/*_A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place?

• A. The better insulation material should be put just next to pipe (i.e., inside)
• B. The better insulating material should be put outside
• C. Either of the insulating material could be put on either side
• D. Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)