Which of the following substitution is done in Bilinear transformations?

• A. s = \(\frac{2}{T}[\frac{1+z^{-1}}{1-z^1}]\)
• B. s = \(\frac{2}{T}[\frac{1+z^{-1}}{1+}]\)
• C. s = \(\frac{2}{T}[\frac{1-z^{-1}}{1+z^{-1}}]\)
• D. None of the mentioned