Which of the following serves as a specific binding site for the proteins involved in membrane fusion during exocytosis?

• A. Phosphatidylinositol
• B. Phosphatidylinositol 4, 5-biphosphate
• C. Phosphatidylinositol 3, 5-biphosphate
• D. Phosphatidylinositol 3, 4-biphosphate