Question: Which of the following is/are the causes of intergranular corrosion?

Options

A : Impurities at the grain boundaries

B : Enrichment of one of the alloying elements at the grain boundary

C : Depletion of one of the alloying elements at the grain boundary

D : Impurities at the grain boundaries, enrichment, and depletion of one of the alloying elements at the grain boundary

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