As company administrator, create a Backbone Network for the various department Engineering(E), Finance(F) and IT. Each department has a Local Area Network (LIE, LZF, L3IT respectively) and connected with four bridges (B1 to B4). The bridges are connected in the following manner, B3 connects to L2F and L3IT. B2 connects to L1E and L3IT. B1 connects to LIE and L2F, and finally B4 connects to all the three department. Select a root bridge for your design. (Show all steps and explain)