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

A)Thrombocytopenia is a deficiency of platelets and may lead to bleeding episodes.
B)Leukemia is an excess of WBCs, but the WBCs are not functional.
C)Anemia is a deficiency of RBCs or of hemoglobin.
D)A deficiency of WBCs is leukocytosis.