Alkyl Halides involving -C-X bond breakage and -C-Nu bond formation simultaneously would follow which one of the following mechanisms?

Alkyl Halides involving -C-X bond breakage and -C-Nu bond formation simultaneously would follow which one of the following mechanisms?

Explanation

In the SN2 mechanism, the C-X bond breaks and the C-Nu bond forms simultaneously in a single concerted step.

It involving a backside attack by the nucleophile and inversion of configuration at the carbon center.