In which of the following scenarios does history create a business advantage?

a. Using its market research, Roasty Toasty devises the best-selling toaster oven to hit the market in the last 20 years.
b. To maintain a business advantage, Crumble Cookies keeps the recipe for its highly popular sugar cookies secret.
c. HiTop’s new ad campaign gives this hair products company a business advantage over competitors.
d. The first company to sell robotic vacuums in the retail market, Run Around Room, uses its experience to maintain a business advantage.
e. Effortless Enterprises and KLB, Inc., both East Coast product design firms, have been fierce competitors for more than 10 years.