Marketers at Walmart will be gathering their primary data over the next several months. Due to the large number of grocery shoppers they would like to reach, the marketers expect this will take several months to complete. Marketers would like a low-cost form of survey research and are not concerned about flexibility. Which of the following forms of survey research woul best fit these requirements?
A. Telephone survey
B. Mail survey
C. Personal interview surveys
D. In-home interview
