By name or number, identify all of the following statements that are true about 2,3-BPG (read: 2 3 B P G) binding to hemoglobin. 1) 2,3-BPG stabilizes the T state 2) 2,3-BPG decreases binding affinity for hemoglobin to oxygen 3) Fetal hemoglobin exihibits high affinity for 2,3-BPG