Comprehension question on parallel plates

Four initially uncharged thin, large, plane identical metallic plates A, B, C and D are arranged parallel to each other as shown. Now plates A, B, C and D are given charges Q, 2Q, 3Q and 4Q respectively. Plates A and D are connected by a metallic wire while plates B and C are connected by other metallic wire. Then after Electrostatic equilibrium is reached,