Which one of the following processes is used for the manufacture of calcium? (a) Reduction of \(...

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Which one of the following processes is used for the manufacture of calcium?
(a) Reduction of \( \mathrm{CaO} \) with carbon.
(b) Reduction of \( \mathrm{CaO} \) with hydrogen.
(c) Electrolysis of a mixture of anhydrous \( \mathrm{CaCl}_{2} \) and \( \mathrm{KCl} \).
(d) Electrolysis of molten \( \mathrm{Ca}(\mathrm{OH})_{2} \).
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