A report writer needs to create a report and wants to ensure they are using...

Workday provides multiple types of data sources when creating reports. Among them,Indexed Data Sourcesare specifically designed for performance optimization on large data volumes. They allow faster retrieval and better scalability when working with high record counts, because they are pre-optimized for reporting and queries.

From the Workday Reporting guide:

“Indexed data sources provide optimized performance for large data volumes. These data sources are indexed on commonly used fields and are specifically designed to support high-performance queries.”

Thus, the correct choice isA. Indexedfor ensuring performance with large datasets.