In the network shown in the figure, each of the resistance is equal to 2 Ω. The resistance between the points A and B is
(1) 1 Ω
(2) 4 Ω
(3) 3 Ω
(4) 2 Ω
(4) The equivalent circuits are as shown below
Clearly, the circuit is a balanced Wheatstone bridge. So effective resistance between A and B is .