P2.1 The logic networks shown in Figure P2.1 use the McCulloch-Pitts model neuron from Figure 2.3. Find the truth tables and the logic functions that are implemented by networks (a), (b), (c), and (d). (T=1 X3 T=1) 0(X, , 43) T=2 0(X, X, X3) (a) (b) X, 12 T=2 0(X, X, X3) T-1 (T=0) 0(x,x) -1 x