For classification problems with two features (d = 2, test point z ∈ R 2 ), which of the following methods have posterior probability distributions of the form P(Y|X = z) = s(Az2 1 + Bz2 2 + Cz1z2 + Dz1 + Ez2 + F) where s is the logistic function s(γ) = 1 1+e −γ and A, B, C, D, E, F ∈ R can all be nonzero?