1. 8232. Which of the following methods may be suitable to use to detect cracks open to the surface in aluminum forgings and castings? 1. Dye penetrant inspection. 2. Magnetic particle inspection. 3. Metallic ring (coin tap) inspection. 4. Eddy current inspection. 5. Ultrasonic inspection. 6. Visual inspection A. 1, 4, 5, 6. B. 1, 2, 4, 5, 6 C. 1, 2, 3, 4, 5, 6.