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If all the resistors shown have the value 2 ohm each, the equivalent resistance over AB is

(1) 2 ohm

(2) 4 ohm

(3) $1\frac{2}{3}\text{\hspace{0.17em}\hspace{0.17em}}ohm$

(4) $2\frac{2}{3}\text{\hspace{0.17em}\hspace{0.17em}}ohm$