GKFix MCQ Question

How is the unknown resistance R₄ calculated when the bridge is balanced?

• A. R₄ = R₁ + R₂ + R₃
• B. R₄ = (R₁ × R₃) / R₂
• C. R₄ = (R₃ × R₂) / R₁
• D. R₄ = R₁ × R₂ × R₃