According to the Case at the End of the Chapter

According to the case at the end of the chapter, entitled "Chasing the NASCAR Fan," how did Josh Linkler get information to better understand the NASCAR audience?

A) He combined information from several secondary data sources, such as A.C. Nielsen, Mediamark, and Simmons, to devise a NASCAR fan persona.
B) He conducted several focus group interviews with NASCAR fans right at the races by providing them prizes for participating.
C) He devised a promotion where NASCAR fans were given an "e-decoder" device to compare with a code given on a Web site to see if they are winners of prizes, and they could do this daily with the provision that they gave a small amount of personal information each time they played.
D) He devised a promotion in which one NASCAR fan was announced as a winner at each race, but to enter the promotion, participants had to give personal information.
E) He used several different promotion tools, such as sweepstakes, contests, games, and premiums to get NASCAR fans to provide personal information in order to be eligible for prizes.