Which of the following is (are)true of the cortex of thymic lobules?

A) It lacks an internal structure of a cortex and a medulla.
B) It is the site of the production of lymphocytes, but not of the T cells.
C) It contains lymphoid stem cells.
D) It contains special capillaries that allow for free exchange between the circulation and the interstitial fluid.
E) They average approximately 20mm in width.