What are the three classes of lymphocytes, and where does each class originate?

On which type(s) of cells are class I MHC molecules located?

a. Antigen-presenting cells only

b. B cells only

c. All nucleated body cells

d. Antigen-presenting cells and B cells

Fill in the blanks: Class I MHC molecules display_____antigens and activate_____cells. Class II MHC molecules display _____antigens and activate_____cells.