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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

(1) ${R}_{1}{R}_{2}{R}_{5}={R}_{3}{R}_{4}{R}_{6}$

(2) $\frac{1}{{R}_{5}}+\frac{1}{{R}_{6}}=\frac{1}{{R}_{1}+{R}_{2}}+\frac{1}{{R}_{3}+{R}_{4}}$

(3) ${R}_{1}{R}_{4}={R}_{2}{R}_{3}$

(4) ${R}_{1}{R}_{3}={R}_{2}{R}_{4}={R}_{5}{R}_{6}$