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What is the correct answer?

4

In permanent mould casting method

A. Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition

B. Molten metal is poured and allowed to solidify while the mould is revolving

C. Molten metal is forced into mould under high pressure

D. None of the above