Which of the following statements are incorrect ? (a) During CO₂ transport in blood, chloride ions (Cl⁻) move from plasma into RBCs and is related to chloride shift. (b) During CO₂ transport in blood, chloride ions (Cl⁻) exit from RBCs in exchange of HCO₃⁻ is called chloride shift. (c) Fetal hemoglobin has lower affinity for O₂ than adult hemoglobin. (d) As acidity increases the affinity of hemoglobin for O₂ decrease. Choose the most appropriate answer from the options given below :