Compare igg, iga, and igm with the other two classes (igd and ige). Which statement is true?
1) Igd and ige are subclasses of igg, iga, and igm.
2) Igd and ige are superior to igg, iga, and igm.
3) Igd and ige are inferior to igg, iga, and igm.
4) Igd and ige are unrelated to igg, iga, and igm.
