Before data from multiple sources can be loaded into the data warehouse, which of the following activities must be performed?

Question $19$ options:

The company must obtain explicit permission from all public and private data sources before their data can be used in the data warehouse.

Operational system reports must be run, as the extraction process that loads the data warehouse usually deletes the data from the operational system.

Data inconsistencies must be removed so that the warehouse has homogeneous data for analysis and reporting purposes.

The operational system must create and file the appropriate XBRL instance document with the SEC.