Which of the following would be a primary data collection method to help you make marketing decisions regarding the new Barney brand cereal? a. You, personally, via a one-way mirror, watch the reactions of 10 different groups of 6 to 10 children eating bowls of the new Barney cereal with its purple dinosaurs. b. You conduct 30 in-depth personal interviews with parents of children to identify the attitudes and purchase intentions of these parents relative to the new Barney cereal and the "I love you, you love me" advertising theme patterned after the television show. c. You send 10,000 trial boxes of Barney cereal to randomly selected households with children in Peoria, IL (a national test market for consumer products) along with a business reply, postage-paid postcard to obtain the reactions of these households to the cereal. d. You contract with major supermarket chains in Phoenix, AZ (a major consumer products test market) to stock 10,000 standard-size boxes of Barney cereal on their shelves. You also contract with InfoScan, a consumer product sales tracking service to determine the effect of a test marketing campaign consisting of ads on Saturday morning children's programs aired locally in Phoenix, coupons in the local Phoenix newspapers, and a direct mailing to all households with children in the Phoenix market. e. All of the above are methods using primary data collection