Although Classified as a Micronutrient, the Iron Ion Fe³⁺ Is

Although classified as a micronutrient, the iron ion Fe³⁺ is a key metallic ion in the Electron Transport Chain of aerobic respiration. Which of the following statements concerning Fe³⁺ is true? (Select all that apply)

A) The low solubility of Fe³⁺ makes it difficult to obtain.
B) Siderophores are molecules that acquire iron from other chemical complexes.
C) Pathogenic bacteria obtain Fe³⁺ from host cells using siderophores.
D) Host cells themselves produce iron-binding proteins that have a lower affinity for Fe³⁺ than do the bacterial siderophores, thus preventing bacterial acquisition.