Which of the Following Strategies Provides an Example of the Most

Which of the following strategies provides an example of the most current era whose principles today's businesses are embracing?

A) At Hefler International, a smart phone manufacturer, the production line is a 24-hour operation, even if demand is tepid.
B) Slick Willy Car Sales always has a large stock of pre-owned cars at great prices. You can almost always get a car for about 30-40% cheaper than at another car sales company, but you buy it "as is," without any warranties.
C) Backstreet Books, Ltd., is known for stocking the top ten books on the monthly best sellers list. These books are almost always available at a reasonable cost to the bookstore, and they usually fly off the shelves. Backstreet Books sees this as a win-win situation for themselves and their customers.
D) Adventure Hotels is all about the experience. Their goal is to make certain that every guest leaves their properties with a better feeling than when they first arrived. The CEO of Adventure says, "We want you to think of our brand first when you make a hotel reservation."