ANS:D - W^-1m²K

The units of resistance to heat transfer are typically represented as: WK​ This unit represents the temperature difference (K) per unit rate of heat transfer (W). It indicates how much temperature difference is required to drive a unit rate of heat transfer through a material or a system. So, none of the provided options exactly matches the standard representation. However, if we convert the units accordingly: −1WK​=KW​1​=W⋅m2⋅K−11​ So, the correct representation in the given options is: W-1m2K.