This is a nucleophilic substitution reaction where the cyanide ion (CN⁻) attacks the carbon adjacent to the bromine. The reaction proceeds via an SN2 mechanism, leading to inversion of configuration at the chiral center. The major product is the enantiomer with the cyano group and the methyl group trans to each other in the ring.

The correct product is the second option, as it shows the expected stereochemical outcome of the backside attack.

Final Answer: Option 2