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Which of the following techniques are used in the extraction of copper?

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Which of the following techniques are used in the extraction of copper?

(a) Refining, down process

(b) Smelting, vacuum pump

(c) Roasting, refining

(d) Roasting

This question was addressed to me in examination.

I want to ask this question from Manufacturing Processes of Copper and its Alloys topic in portion Copper and its Alloys of Aerospace Materials & Processes

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Right answer is (c) Roasting, refining

To explain: The extraction of copper from its ores is done through several techniques that include roasting, refining, smelting, crushing etc. Dow’s process is done to obtain the substance magnesium, not copper.

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