Soundz, a Marketer of High-End Headphones, Wants to Better Understand

Soundz, a marketer of high-end headphones, wants to better understand how consumers think and feel about its products. Which of the following would be the best tool to help the leadership at Soundz learn about consumer attitudes toward the brand?

A) predictive technology
B) scanner data
C) machine learning
D) sentiment analysis
E) search engine optimization