GKFix MCQ Question

What is the correct expression for n₂₁ if n₁₂ is known?

• A. n₂₁ = n₁₂
• B. n₂₁ = 2n₁₂
• C. n₂₁ = 1/n₁₂
• D. n₂₁ = n₁₂²