Which of the following is the best example of a product line?
a. General Motors offers passenger cars, small trucks, and tractor trailers.
b. Sony offers DVD players, compact disk players, and video game consoles.
c. Kellogs offfers Special K, Raisin Bran, Corn Flakes, and a variety of other cold ready-to-eat cereals.
d. Hewlett Packard offers scanners, printers, and personal computers.