Liam’s interest in growing sales from his younger customer segment prompts him to think about gathering more data from this audience. In a survey to existing subscribers he includes additional drop-down questions about how often they wear ties and what age range they are in. This type of data source can be described as a/an:

An Audience field is a custom data point you create within your Mailchimp audience to store specific information about your subscribers, such as age range or preferences. Liam is adding new questions to his survey to collect this kind of detailed information directly from his subscribers, which will then populate these fields in his audience. This allows for more targeted marketing efforts. A Group is a way to categorize subscribers based on shared interests or characteristics, but the method of collecting new data points like age range is through an Audience field. A Segment is a filtered portion of your audience based on existing data, not a method for collecting new data. An Integration connects Mailchimp with other apps or services, which is not what Liam is doing here.