What is the formula for resolution Rs between two peaks and what does a higher Rs indicate?

What is the formula for resolution Rs between two peaks and what does a higher Rs indicate?

• A. Rs = (t_R2 - t_R1) / (0.5*(W1 + W2)); higher Rs means better separation.
• B. Rs = (t_R2 - t_R1) / (W2 - W1); higher Rs means worse separation.
• C. Rs = (W2 - W1) / t_R; higher Rs means longer run times.
• D. Rs = t_R2 / t_R1; higher Rs means faster elution.

Answer: (A)