We keep here the same hypothesis and notations as in the previous question.The statistical average of the non-
linear term (∂(WT))
a) ∂((W)(T))+∂(τ^w^)
b) (W)∂(T)+(w^)∂(τ^)
c) (W)∂(T)+(T)∂(W)+∂(w^τ^)
d) (W)∂(T)+(T)∂(W)+(w^)∂(τ^)+(τ^)∂(w^)