Heavy water $(D_2O)$ is primarily prepared by which of the following methods?
- AReaction of $D_2$ with $NH_4OH$
- BOxidation of $D_2$ with ozone
- CExhaustive multistage electrolysis of $0.5 \, M \, NaOH$ aqueous solution using nickel electrodes
- DExhaustive electrolysis of a mixture of $Ba(OH)_2$ and $H_2SO_4$
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