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Which of the following acid that results in selective removal of aluminum in aluminum bronzes?

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Which of the following acid that results in selective removal of aluminum in aluminum bronzes?

(a) Hydrochloric acid (HCl)

(b) Hydrofluoric acid (HF)

(c) Nitric acid (HNO3)

(d) Hydrochloric, hydrofluoric and nitric acid

I got this question during an interview.

The query is from Eight Forms in portion Eight Forms of Corrosion of Corrosion Engineering

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Correct option is (b) Hydrofluoric acid (HF)

To elaborate: Selective Leaching is the removal of one element from a solid alloy by the corrosion process. And selective removal of aluminum from aluminum bronzes can be resulted by using hydrofluoric acid.

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