The relationship between e, S and na is ______

• A. \(n_a=e*\frac{1+S}{1+e}\)
• B. \(n_a=e*\frac{1-S}{1-e}\)
• C. \(n_a=\frac{1-S}{1+e}\)
• D. \(n_a=e*\frac{1-S}{1+e}\)