A.
Thymus and bursa of Fabricius are central lymphoid organs
B.
Spleen, lymph node and tonsil are peripheral lymphoid organs
C.
The submucous tissues of digestive tract, respiratory tract and urogenital tract are rich in lymphoid tissue
D.
Lymph nodes are mostly distributed near the organ door, along the blood trunk, and in the body fossa, collecting the lymph in the area
E.
All of the above are correct