In the above reaction, the reagent "A" is
$\mathrm{NaBH}_{4}, \mathrm{H}_{3} \mathrm{O}^{+}$
$\mathrm{LiAlH}_{4}$
Alkaline $\mathrm{KMnO}_{4}, \mathrm{H}^{+}$
$\mathrm{HCl}, \mathrm{Zn}-\mathrm{Hg}$
Correct Option: , 3
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