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Consider the following statements:

Addition of silicon cast iron     

1. Promotes graphite module formation

2. Promotes graphite flake formation

3. Increases the fluidity of the molten metal

4. Improves the ductility of cast iron

Which of these statements are correct?

(a) 1 and 4                      (b) 2 and 3

(c) 1 and 3                      (d) 3 and 4

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