Which is the major product of the following reaction?

Name: Which is the major product of the following reaction?
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Question

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The reaction involves addition of HBr to a double bond and then reduction with NaBH4. The addition of HBr will occur predominantly via Markovnikov's rule, resulting in the formation of 3-bromo-2-methyl-2-pentanol. Reduction with NaBH4 will then convert the -CHOHBr group to -CH2OH, leading to the final product of 3-mercapto-2-methyl-2-pentanol.

Which Is the Major Product of the Following Reaction