Objective question in Electric Current

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In the given circuit it is observed that the current i is independent of the value of the resistance R6. Then the resistance values must satisfy
a) R₁R₂R₅ = R₃R₄R₆ b) frac{1}{{{R}_{5}}}+frac{1}{{{R}_{6}}}+frac{1}{{{R}_{1}}+{{R}_{2}}}+frac{1}{{{R}_{3}}+{{R}_{4}}} c) R_Â1R₄ = R₂R₃ d) R₁R₃ = R₂R₄

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