The text provides three primary strategic approaches $($differentiation$,$ cost$,$ and response$)$ for achieving competitive advantage. Provide an example of each. Support your choices. Choose the correct example of differentiation and its explanation below.

A$.$ Johnson Electric, as it specializes in industrial and commercial electrical construction projects.

B$.$ Hunter Fan, as it's a premier maker of quality ceiling fans that lower heating and cooling costs for its customers.

C$.$ Hunter Fan, as it guarantees delivery in $3$ days.

D$.$ Johnson Electric, as it competes on speed$-$speed in design, production, and delivery.