How can an Einstein Analytics consultant derive those KPIs from those datasets?

A company wants to build a webpage that displays KPIs that can be derived from values in datasets stored in Einstein Analytics.

How can an Einstein Analytics consultant derive those KPIs from those datasets?
A . Use the Analytics External Data API and leverage the "query" resource.
B . Export the dataset as an XLS file and use the Einstein Analytics Connector for Excel.
C . Use the Analytics REST API and leverage the -query" resource.
D . Export the dataset as a CSV file and load it to an external database.

Answer: A