What does the Hyper API allow users to do with data sources?

The Hyper API primarily allows users to interact with Tableau Hyper files, enabling efficient updates to data stored within those extract files. This functionality is crucial for maintaining and refreshing data, as it supports the direct manipulation and updating of the data contained within Tableau's Hyper format. By allowing users to add, modify, or remove records, the Hyper API facilitates streamlined data management workflows without needing to re-create complete extracts, greatly enhancing efficiency in data handling.

In contrast, while synchronization with web applications or creating alerts for data changes might be tasks related to data management, they are not directly supported functions of the Hyper API itself. Similarly, exporting data visualizations pertains more to the presentation and reporting aspect of Tableau rather than the direct manipulation of data sources within Hyper files. Thus, the focus of the Hyper API is specifically on the efficient updating of data in extract files, making option B the correct answer.