2. A 5-year-old boy was brought to an emergency department by his parents for an episode of sickle crisis. The medical history showed that the patient had HbS. Which one of the followings following would most likely be the pattern of hemoglobins identified in this patient's peripheral-blood sample? A. HbS, HbA2, HbF, and HbA B. HbS, HDF, and HbA C. HbS, HbA2, and HbF D. HbS and HbF