How do the concerted and sequential models together explain hemoglobin's binding behavior?

• A. They describe the constant affinity state and non-cooperative binding of oxygen.
• B. They describe the fluctuating affinity state and variable binding of oxygen.
• C. They describe the transition from low to high affinity states and the cooperative binding of oxygen.
• D. They describe the transition from high to low affinity states and the non-cooperative binding of oxygen.

Answer: (C)