Is it true or false that you can unpublish a dataset if there are custom reports that use the data source?

The assertion is false. In Workday, if a dataset is published and there are active custom reports that rely on that data source, you cannot simply unpublish it. This is to maintain the integrity and functionality of the reports that depend on the underlying data. Unpublishing a dataset while active reports exist could lead to inconsistencies and reporting errors, which Workday prevents by disallowing this action.

The other options might imply additional conditions such as requiring admin approval or archiving reports, but these situations do not change the fundamental rule that you cannot unpublish a dataset in use by reports to ensure that all dependent reports remain operational and accurate.