As shown in the figure below, a cube is formed with ten identical resistance \( R \) (thick line...

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As shown in the figure below, a cube is formed with ten identical resistance \( R \) (thick lines) and two shorting wires (dotted lines) along the arms \( A C \) and \( B D \).
Resistance between point \( A \) and \( B \) is
[KVPY 2012]
(a) \( R / 2 \)
(b) \( 5 R / 6 \)
(c) \( 3 R / 4 \)
(d) \( R \)
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