The inactiveness of aluminium in the presence of conc. \( \mathrm{H...

The inactiveness of aluminium in the presence of conc. \( \mathrm{HNO}_{3} \) is due to the formation of a layer of
a. AlN
b. \( \mathrm{Al}_{2} \mathrm{~S}_{3} \)
c. \( \mathrm{Al}_{4} \mathrm{C}_{3} \)
d. \( \mathrm{Al}_{2} \mathrm{O}_{3} \)
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