Darren has developed a better type of medication vial for travelers. He is not sure how to develop a marketing program for his product, as there are a few similar ones on the market. What technique can Darren use to analyze data from his competitor's websites, particularly to learn how people search for similar products online?
a. click-path data.
b. budget analysis.
c. social influence.
d. sentiment analysis.
e. keyword analysis.