29. Why is aluminum protected from corrosion? (Note: The standard reduction potential for \( Al^{3+} \) is -1.66 V.) (A)aluminum forms a protective oxide coating (B)the oxidation of aluminum is not a favored process, as seen by the standard reduction potential for \( Al^{3+} \) (C)oxygen and aluminum have no affinity for one another (D)at least two of these are correct (E)aluminum is not protected from corrosion