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Cracks formed by carbonate stress corrosion are best detected:
Correct Answer: D
According to API RP 571 Section 5.1.2.6 (Carbonate Stress Corrosion Cracking - CSCC): "The cracking is usually intergranular and is most commonly detected using wet fluorescent magnetic-particle testing (WFMT) after surface cleaning. PT may not be sensitive enough to detect fine cracks formed by this mechanism." Because CSCC cracks are typically surface-connected and very fine, WFMT offers the best visibility, especially after proper surface prep. Therefore, Option D is correct.