Definition: You are given a question on machine learning. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which of the following is false?
(A)The following fully connected network without activation functions is linear: $g_3(g_2(g_1(x)))$, where $g_i(x) = W_i x$ and $W_i$ are matrices. (B)Leaky ReLU $\max\{0.01x,x\}$ is convex. (C)A combination of ReLUs such as $ReLU(x) - ReLU(x-1)$ is convex. (D)The loss $\log \sigma(x)= -\log(1+e^{-x})$ is concave
