What is the value of DR?

• A. DR=\(\frac{1-2ρ_p}{1+ρ_p}\)
• B. DR=\(\frac{1+ρ_p}{1-ρ_p}\)
• C. DR=\(\frac{1+2ρ_p}{1-ρ_p}\)
• D. DR=\(\frac{1-ρ_p}{1+ρ_p}\)