Which of the following statements are true of the spleen and thymus? (Read carefully and select all of the correct statements.)

A)The spleen is located behind the stomach and is protected by the right lower rib cage.
B)The thymus is located on the back of the trachea above the thyroid gland.
C)The thymus is a source of T lymphocytes and is the site of maturation for these cells.
D)The spleen is a reservoir for platelets and monocytes.
E)If the spleen must be removed, the liver will help compensate by producing antibodies.
F)The thymus is essential for the development of cell-mediated immunity.