Your new client has the leading brand of hemorrhoid cream . Your job is to determine the target market's attitudes toward the brand and their usage patterns, however, one of the things you know about the target market is that they won't even admit to using the product, let alone discuss it. How can you leverage social media data to learn more? Which of the following is used to assess people's knowledge, beliefs, preferences, and satisfaction and to measure these magnitudes in the general population?