Which Analytics 360 feature allows the creation of a new data set by combining data from multiple source properties?

The correct answer is the option that refers to roll-up properties. Roll-up properties in Google Analytics 360 allow users to consolidate data from multiple source properties into a single property for easier analysis and reporting. This feature is particularly beneficial for organizations that manage multiple websites or apps, as it provides a more comprehensive view of user interactions across all properties without the need for complex data manipulation or aggregation processes.

By utilizing roll-up properties, businesses can gain insights into overarching trends, user behavior, and performance metrics across various platforms from a unified interface. This capability is essential for understanding cross-platform performance and making informed decisions based on a holistic view of the data.

The other options pertain to different functionalities within Google Analytics. Data Import is used to bring additional data into GA from external sources but does not specifically combine multiple properties. Data Streams are the paths through which data is sent to Google Analytics, generally referring to a single source of data. Audience Builder is a tool that allows for the segmentation of users based on defined criteria but does not facilitate the combination of data sets from different properties.