Aluminum being lower than zinc in galvanic series provides lesser protection to steel compared to the zinc coating. Which one of the following is a true statement?

A. Aluminum coating provides good corrosion protection compared that of zinc at elevated temperatures
B. Zinc is always preferred over aluminum coating irrespective of the temperature of metal surface
C. Aluminum is never used as coating material
D. Aluminum reacts with steel , so cannot be used for coating steel