Which of the following statements is/are correct?
a) Iron deficiency may be mild or severe
b) Transferrin is a protein within the cell that is used for iron storage.
c) Secondary iron deficiency arises due to insufficient consumption of dietary iron.
d) Hemochromatosis is one form of iron deficiency anemia.
e) Ferritin is a protein found in blood plasma that binds to and transports iron throughout the body.