Which of the following environments is BEST used for copying data and transformation into a compatible data warehouse format?

A development environment is for writing and testing code, not typically for the large-scale extraction, transformation, and loading of production data.

A testing environment is used to validate system functionality and data integrity, usually with prepared test data, not for the ongoing process of transforming and loading production-like data for a data warehouse.

Replication involves duplicating data from one system to another, often for backup or disaster recovery, but it doesn't inherently include the complex transformation processes required for a data warehouse.

A staging environment is specifically designed as an intermediate area where data is extracted, transformed, and loaded (ETL) before being moved into the final data warehouse. This environment allows for data cleaning, validation, and format conversion without impacting source systems or the production data warehouse.