Identify the nucleophilic and electrophilic sites in the substrate and reagent of the following reaction.

◦ The nucleophile is b and the electrophile is c.
◦ The nucleophile is d and the electrophile is b.
◦ The nucleophile is b and the electrophile is d.
◦ The nucleophile is c and the electrophile is e.
◦ The nucleophile is c and the electrophile is b.