1.2 alpha globin chains, 2 beta globin chains & 2 heme moieties
2.2 alpha globin chains, 2 beta globin chains & 4 heme moieties
3.2 alpha globin chains, 1 beta globin chain & 3 heme moieties
4. 4 alpha globin chains & 4 heme moieties
Answer:2