Which of the following does not represent Kbiphasic?

• A. \(\frac{[B_{org}]}{[A_{org}]}\)
• B. \(\frac{[B_t]}{[A_t]}\)
• C. \(K_w (\frac{1+αP_B}{1+αP_A})\)
• D. \(K_w \frac{P_B}{P_A}\)