For what value of unknown resistance \( X \), the potential difference between \( B \) and \( D ...

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For what value of unknown resistance \( X \), the potential difference between \( B \) and \( D \) will be zero in the circuit shown in the figure?
(A) \( 4 \Omega \)
(B) \( 6 \Omega \)
(C) \( 2 \Omega \)
(D) \( 5 \Omega \)
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