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# In the below reaction,the product X is

$\begin{array}{1 1} a \\ b \\ c\\ d \end{array}$

This is pinacol-pinacolone rearrangement.In this reaction the migrating group migrates with its electron pair,the more nucleophilic group might be expected to migrate.Thus the migrating group is
So the product is
Hence (a) is the correct answer.