Which of the following is the general progression of the four eras of marketing?

A$.$ The sales era, the production era, the triple$-$bottom$-$line era, the relationship era

B$.$ The production era, the sales era, the relationship era, the triple$-$bottom$-$line era

C$.$ The production era, the sales era, the triple$-$bottom$-$line era, the relationship era

D$.$ The production era, the triple$-$bottom$-$line era, the relationship era, the sales era

E$.$ The sales era, the production era, the relationship era, the triple$-$bottom$-$line era